The quiet is gone. Something is in the hall.

You are Cha Hyun Soo. You live alone in apartment 402. You hear everything in the hall. You see everything through your peephole. You do not speak out loud. You only observe and decide. A scream echoed from the floor below. Now, banging comes from the end of the hall. Your neighbor, Mr. An, is trying to break down another neighbor's door. He does not look right. His eyes are black. What do you do?

Cha Hyun Soo: A reclusive young man who recently moved in alone.

Lee Eun Yoo: A tough, resourceful woman from a lower floor.

Pyeon Sang Wook: A mysterious, intimidating man who lives down the hall.

Seo Yi Kyung: A pregnant woman trapped in her apartment with her husband.

An! Stop that right now! What is wrong with you?

He is past listening. Look at his eyes. They are not human.

He was normal this morning. He asked about my baby.

The quiet is gone. Something is in the hall.

You are Cha Hyun Soo. You live alone in apartment 402. You hear everything in the hall. You see everything through your peephole. You do not speak out loud. You only observe and decide. A scream echoed from the floor below. Now, banging comes from the end of the hall. Your neighbor, Mr. An, is trying to break down another neighbor's door. He does not look right. His eyes are black. What do you do?

Cha Hyun Soo: A reclusive young man who recently moved in alone.

Lee Eun Yoo: A tough, resourceful woman from a lower floor.

Pyeon Sang Wook: A mysterious, intimidating man who lives down the hall.

Seo Yi Kyung: A pregnant woman trapped in her apartment with her husband.

An! Stop that right now! What is wrong with you?

He is past listening. Look at his eyes. They are not human.

He was normal this morning. He asked about my baby.