On the night that 17-year-old Dong-jun's only friend, Kang-hyeon, fell from a high place, Dong-jun made a choice that determined the direction of his entire life. Dong-jun's regrets and remorse following that choice made him experience life in three different universes. These are the various lives of the 42-year-old Dong-juns who live different lives in Seoul, Daegu and Busan 20 tears later.

So Long, See You Tomorrow

Tae-jeo, a correctional officer with 15 years of experience, learns about the death of an inmate's mother during a night shift. On that winter night, she visits the funeral home and unexpectedly meets the inmate's daughter, Jun-young. Their encounter brings warmth to both their lives, and Tae-jeo hopes Jun-young understands: “Every decision you make shapes who you become."

Home Behind Bars

Jung-ha, a teacher in Chuncheon, has a secret relationship with Ji-seon. When her son Jin-woo visits with his girlfriend Jenny, he reveals his plans to marry Jenny and become a YouTuber, leaving Jung-ha anxious. Making things worse, Jenny's parents unexpectedly visit and her secrets are exposed. The families part ways with newfound understanding.