Jiyoung sits in front of the same bus stop at the same hour every night. Hyunmin, who takes the last bus after work and gets off at the same stop, notices her. One rainy night, he musters up the courage to talk to her and offers her his umbrella.

Sunhae rents a supposedly quiet place in the middle of an alley, but the old place is riddled with problems like leaks and flickering lights. On top of that, she hears someone singing loudly every night outside.

Detective Sungsik investigates the death of an old man in his district. It seems like a natural death, but everything at the scene looks unnatural to him. Not being able to close the case, the detective begins investigating on his own to find clues.

An undertaker who works in the mortuary on the fourth basement floor and a nurse who works in the Intensive Care Unit on the eighth floor begin their night shift at the university hospital. They face mysterious situations.

On a rainy night, a bus filled with passengers leaves the bus garage. The driver changes the bus sign to `not in service' and tries to stop taking passengers. However, things do not go as planned.

The body of a person without family is brought into the mortuary. As the deceased seems to be full of regrets, the undertaker waits three days as a sign of respect. With their three days, the deceased desperately tries to protect a loved one.