Soo-hyun, a fourth-year elementary school teacher, is about to get married. One day, Yohan, a student in her class, comes to Soohyun, who was busy and happy. Yohan confesses to Soohyun that he is experiencing domestic abuse. But the next day, John's lies await Soohyun.

At 24, Hae-jin is caring for her mother, Jung-woon, who is in a coma—and finds herself wanting to run away dozens of times a day. One day, an aunt she has never met, Jung-hye, suddenly appears, holding an old childhood photo of Hae-jin. But Hae-jin remains wary of her. After moving her mother into a nursing facility, Hae-jin lives with a growing sense of guilt. Then, while cleaning out her mother's house one day, she finds the very same photo her aunt had shown her. That discovery leads her to the past Jung-woon once ran away from—and toward a new beginning of her own.