The label M4N has decided to pit 23 male trainees against each other to see who will succeed, who will win the chance to debut. You the audience get to vote for every aspect of the show. You decide who stays. You decide who goes home.

Back in school, a dare brought him to her and he tried not to let go. After school she moved away abandoning him. Now he's a famous idol and she's back. But she didn't come back for him. And she's not alone. How will Yoo Kihyun handle his schooldays crush now a mother trying to be friends with his mother? Does he make a move? Does she admit why she had to move away? Or will her toddler make the decision for them both?