The story is about Kaisoo it's called regret cause at the end of the story they will all regret about different reasons
Kai,kyungsoo,taemin.chanyeol they will all regret
Jimin is going to his best friend, Taehyung's wedding. On the way there, Jin makes him remembers some of the best and worst memories. Jimin saw something that can affect the wedding but he wants to bury it in the sky. Also, the person he loves is getting married.
The story jumps around the timeline.