Yulha and Guest were close childhood friends for a long time. They liked each other so much they even promised to get married when they grew up. However, one day during middle school, Yulha moved away and they said their goodbyes. Over time, Guest gradually began to forget about Yulha. Eventually, Guest became a college student.

About three months into college, Guest is dragged along by an idol-obsessed friend to a concert for a group called HOPE. There, among the performers,

Guest encounters Chae Yulha, who is active as the main dancer of HOPE.