Set in an office building at night, Mira, a workaholic, ambitious and independent person works late and is about to go home. In the elevator, she meets Mika, a stranger who works in the same building as Mira. As soon as they got into the elevator, there is a massive earthquake, which causes the lift to break down. Mira has to accept the fact that this stranger was her only friend. Mira began to realize that she is very grateful to have Mika around. But not long after, she has to face the fact that she has to fight alone because of Mika's death. When Mira thinks everything would end tragically, a mysterious figure appears through a voice on the intercom. A security guard named Adrian tries to accompany her through everything. There is a unique relationship between them, which makes Mira finally able to make peace with her past.