A story in which high school junior Lee Chan falls in love with the sweet Kim Yerim.

If I had known you just a little longer, maybe we could've fallen in love. I'm sorry I missed my chance.      

Soonyoung is just a normal teenage boy, trying to love himself. But Yewon observes, and she learns that he is much more than what he thinks of himself. His soft-spoken heart, lovable personality, and his energy to cheer her up. But can she discover the same for herself? "I'll always remember this summer, Soonyoung."    

"You know, Seulgi, once I debut, we can't be with each other." "I know. But when you're happy on your first stage, I'll be happy." "Then, why are you still crying?" "I'm going to miss it a lot. Us."