At the beginning of the third episode, we see that when Hyun-soo's family went on a
trip, he is also with them.
He is arguing with his family about something and says that you all die, and then a truck
hits the car.
Now when Hyun-soo regains consciousness, he is in the hospital.
He is talking to someone whose face is not shown.
Hyun-soo tells him that he had a dream.
Now whatever we have seen so far in the first and second episodes seemed to be his dream.
After this he goes out where all the people start disappearing in front of his eyes and
then he encounters the monster side of himself, who tries to convince him to embrace his evil
side.
A huge monster attacks him knows as protien monster.
The kids try to get him out of there but the monster comes out and is about to catch the
kids, but Hyun-soo grabs his leg and tells the kids to run away.
Now the monster throws him on a wall and starts attacking him, but then Jae-heon attacks the
monster and knocks him down.
Then they take Hyun-soo away from there and here they come to know that he is infected.
Hyun-soo says that he had promised the children that he would save them and he asks for their
help.
Here Yeong-su urinates out of fear of monsters and they are just about to leave when the
Lotus Root Monster comes there.
Seeing him, both the children are very scared, only then Su-yeong remembers Hyun-soo saying
that this monster can't see but its ears are very sharp.
She closes her and her brother's mouth and then after some time the monster leaves from
there.
Then he slowly starts going up, but then the Protein Monster comes there and as soon as
he is about to catch them, the Lotus Root Monster attacks him and taking advantage of
the opportunity, the children leave from there.
Now Protein Monsters starts beating the Lotus Root Monster very badly and then throws it
out the window.
Here the kids had come on the 15th floor and they are banging everyone's bells and doors
to help but the protein monster comes there too.
Now he starts moving towards them but then Myung-sook comes over there.
She asks the monster to leave the children but he attacks her.
Now Myung-sook starts to see his baby girl and as she is coming towards him, the monster
crushes her.
Myung-sook stands in front of the monster and says that she knew very well that she
had lost her child and then the monster starts attacking her and in the meantime all three
of them also come there.
Children also come to all three after seeing the opportunity and now the monster turns
towards them, but then Myung-sook jumps and attacks the monster because she too had now
become a monster.
Seeing this, Ji-soo and Jae-heon also attack it but the monster catches Myung-sook and
throws her to the ground.
Now Jae-heon tells Ji-soo to leave and now the monster turns towards them.
When the monster attacks him, he dodges it and starts running away and the monster starts
going after him.Jae-heon escapes from the monster and stands in front of a window, and
when the monster tries to catch him running, he moves away and the monster falls out of
the window.
Here Ji-soo sees that Myung-sook is infected but she asks him about the children and then
heals herself and reverts to human..
Ji-soo tells her that the baby is fine and she is taking him to Du-sik's room when Myung-sook
tells her to go and help Jae-heon and Ji-soon tells her to go to room number 1408.
On the other hand, in a broadcast, the president announces emergency and asks everyone to stay
indoors.
He was addressing the people of the country when suddenly blood starts coming out of his
nose and he starts turning into a monster and says that everyone will be killed and
only then the army shoots and kills him.
Here Yi-Kung goes to the basement and tries to fix the building's electricity, and when
she is coming back, a monster attacks her and drags her away.
Here Eun-hyuk is in the control room when Lee comes to him and tells him that Yi-kyung
should have returned by now.
Eun-hyuk tells him that someone has turned the security camera in the basement.
Here Yoon-jae comes to the first floor with a bag and they all start questioning him.
He tells that a thief had entered his house.
Then he opens his bag which contains a lot of food.
Seeing this, everyone becomes very happy and he starts distributing food to everyone.
Then after sometime Eun-hyuk makes an announcement and asks all the people of the building to
come on the first floor because if they all stay together then they will be safe.
Then he hears some sound and when he comes out he sees that Cha Jin is trying to forcefully
go out.
She tells him that her daughter is nearby but Eun-hyuk tells them to lower the shutter.
But he sees that his daughter is running towards him and only then Lee runs outside to save
her.
But the tongue monster attacks him and it also kills Cha Jin's daughter and starts sucking
her blood.
Everyone is shocked to see this and the screen turns black showing Lee and the girl's corpse.
Now Eun-hyuk is blocking the shutter when he narrowly escapes the Tongue Monster attack
and the Monster pulls back its tongue as the shutter closes.
Cha Jin becomes deeply saddened to see her daughter's death and starts blaming Eun-hyuk
for her death.
On the other hand Ji-soo and Jae-heon get ready to go to the first floor and before
leaving Ji-soon says that even the thickest darkness disappears with the faintest light.
Hearing this, Hyun-soo also asks him to accompany them and Du-sik tells them to take care of
themselves.
Now all three of them leave from there and Du-sik says that suddenly he is like the head
of a kindergarten.
Now here we see 2 new characters Gil-seob and Yuri.
Gil-seob is a terminally-ill patient living with his caregiver Park Yoo-ri.
He tells Yuri that now they should go to the first floor and help everyone.
Here in the basement we see the tentacle monster going towards Yi-kyung who is wrapped in his
web.
But we see that Yi-kyung had escaped from there, and she tries to get out through the
ducts.
Now the tentacle monster starts chasing her but she somehow hides from it and then tries
to get out by breaking an exhaust fan.
Now as soon as she starts going down, the monster comes there and grabs her with its
web.
Yi-kyung breaks a window and frees herself by cutting a web out of its glass.
Just then her phone rings and it is her fiance sangwon's call.
But the phone is far from her reach.
She then comes back where she punches Eun-hyuk and asks if he knew there was a monster there?
Now there is an emergency official government announcement, in which all the decisions of
the country will now be taken by the military.
He tells that many people are turning into monsters and it is believed that it is related
to human desire.
There is a time of 1 hour after a person dies and becomes a monster and only in this time
these monsters can be killed and the military has named this time as Golden Hour.
Here all three of them are coming down when suddenly, something attacks Hyun-Soo, making
him free-fall from the 9th floor to the ground and Eun-Yu also stands there who gets scared
seeing him.
Now in a flashback, we see Hyun-soo crying for his family at their funeral when some
people say that he has become a monster and starts taking him away, but then he wakes
up.
Where Eun-yu stands beside him.
He asks her about the kids, to which she says that they are safe.
Now that Hyun-soo's monster identity is revealed, the survivors discuss whether or not Hyun-soo
should be kicked out.
Eun-Hyeok suggests they hold a poll, but the convenience store owner Seok-Hyeon insists
that Hyun-soo must be kicked out.
To everyone's surprise, the result of the poll is a tie, and Seok-Hyeon is furious and
starts abusing everyone who wants Hyun-soo to remain with them.
But He suddenly gets a nosebleed, showing symptoms of turning into a monster.
Hyun-soo asks if he is allowed to vote? and have himself isolated along with Seok-Hyeon.
Now some people are talking here that how should he kill Hyun-soo because he cannot
die and Yoon-jae is listening to these things.
He leaves and starts thinking about something but there he finds Sang-wook who starts beating
him badly.
Yoon-jae overturns, pushes him and then starts running away.
Then he goes to the rest of the people and lies that he too has been infected and asks
him to isolate.
Now they are locking him up when Jae-heon comes there and asks him if he is lying?
And then Sang-wook also comes there but Jae-heon stops him.
After a while Yoon-jae starts talking to Hyun-soo and asks him how it feels to be a monster?
He says that he also wants to become a monster and how to become monster.
Now in a flashback we see that when Yoon-jae pushed Sang-wook, he took out the key to his
room.
On the other hand, Yi-kyung is sitting alone when Sun-young comes up to her and gives her
food.
She asks her to have food but then her health starts deteriorating and she says that her
stomach is little upset.
Later, when she is coming out of the washroom, Sun-young gives her a pregnancy test kit and
asks her to check it once.
Now the scene shifts to 1408 where Su-yeong tells Du-sik that Myung-sook has not come
out of the bathroom for 1 hour.
Now hearing this he gets worried and asks her to step back.
He gets his gun ready and opens the bathroom door where he sees a monster but is shocked
to see it, and the episode ends here.
At the beginning of the 5th episode, Eun-hyuk comes to the isolation room and asks Hyuk
to accompany him.
Suk-hyun stops him and tells him that they are taking advantage of him, but Hyun-soo
leaves.
Taking him out, Eun-hyuk tells him that now he will have to do many dangerous tasks for
them.
He asks her to go upstairs and retrieve Du-Sik.
Meanwhile, Du-Sik observes that Myung-Sook has turned into a monster, a fetus-like shape
which heart still beats.
Now in a flashback, Myung-sook and Du-sik are sharing their sorrow in which they talk
about their children.
Myung-sook says that if she becomes a monster, then kill her, but he says that he cannot
do this because without her he will not be able to take care of the children.
Du-sik now tries to kill him but just then he hears the sound of a small child and he
lowers his gun and closes the bathroom door.
Then he tells the children that Myung-sook has left and now they will have to live without
her.
Then he sees that before becoming a monster, she had prepared food for them.
Now Sang-wook starts going upstairs to search Yoon-jae's room, and while Hyun-soo is also
leaving, Eun-hyuk tells him to first save Han Du-sik, and if things go wrong then leave
the kids there.
Hyun-soo is shocked to hear this.
Now Yi-kung doesn't like his plan but Eun-hyuk explains to him that people didn't vote for
Hyun-soo like that, they are all scared that they might become monsters anytime.
Then he says that there is a person who knew all this even before the announcement of the
government, he had found a vlog on the internet in which it was written about this curse.
He shows her the vlog that sparks her memory with her fiancé and she realizes that her
fiance is involved in it.
On the other hand, In a burning hallway, Sang-Wook is suddenly snatched by the "Reach" monster
and when Hyun-soo goes to save him, a Speed" monster attacks him.
Now he proceeds to attack him again.
But the monster is scared by Gil-Seob and Yu-Ri.
Just then Hyun-soo appears in front of them and they discover that Sang-Wook is only knocked
unconscious.
As they retrieve him, through the diary beside the dead monster, it is revealed that the
guy lost his son because he could not reach his hand when that monster was taking away
his son, and that he can't let go of the guilt so that he succumbs to the monster.
As Sang-Wook recovers, Yuri tries to treat his wounds but he refuses her and leaves from
there.
Here Yoon-jae notices that he does not have his key and understands that Sang-wook has
gone towards his room.
Sang-wook is looking for something in his room but when he does not find anything, he
starts leaving from there.
But when he puts the key to the room next to her, it opens and he discovers the room
to be a red room, finding photos of abused children - indicating that Yoon-Jae is a pedophile.
Here, when Hyun-soo reaches Du-sik's room, he sees that Myung-sook has become a monster.
Yi-kyung's pregnancy test comes out positive, and Jae-heon and Ji-soo write SOS on a cloth
and hang it on the building.
Now Yoon-jae comes out of isolation by making some excuse and goes to the bathroom and takes
out a hammer.
Sang-Wook comes back in a rage when Jae-heon tries to stop him but Sang-Wook's phone falls
there.
Now he's looking for Yoon-jae when he hits her with a hammer from behind but Sang-Wook
goes all out on him and he kills him by hitting him repeatedly in the face with a hammer.
He then drags his body, throws it outside the building and comes back with the body
of Su-Ung and Cha Jin's daughter.
Although he wants to isolate himself outside, Jae-Heon stops him and he falls unconscious.
After this the survivors build a funeral for the dead residents.
Now Du-sik gets to work on making the shutter stronger and Hyun-Soo keeps on doing dangerous
tasks for Eun-hyuk.
Then we see Tongue Monster sucking Yoon-jae's blood when a bigger monster grabs him and
takes him away.