"Finding a place to belong is hard if people don't accept you for who you are."

Yoon Ahreum is a 21-year old production staff working  for MBC. Because of her young age, she was outcasted. When Infinite Challenge announced they'll have a reunion concert for Sechskies, a first generation Kpop idol group, she is determined to help working with them dilligently, especially the fact that her dying uncle was Sechskies' former manager. During production period, Ahreum gets herself in a car accident. But instead of waking up in heaven, she finds herself waking up in early 1999, where Sechskies was still active and ends up staying in Lee Jaejin, a 20-year old man who is a part of the group. Jaejin is also an outcast due to his odd behavior and personality but tries hard as he is one of the main dancers of the group. As Ahreum(who presumes the name of Jin Hanbyul) stays in that timeline, the more she spends her time with Sechskies, especially Jaejin, who made her she belonged in that world where she doesn't belong. Whereas Ahreum made Jaejin felt the same way, as his world changes around her.

Will Ahreum/Hanbyul and Jaejin find a world where they both belong, even when they meet again in Ahreum's respective timeline?