On a summer day, Doyoung loses her younger sister Dohee in an accident. At the moment when she thinks she would never be able to meet her again, she finds out that Dohee is still in this world due to the mistakes of soul-collecting students. Will Doyoung, who is able to reach Dohee, be able to say goodbye to her?

Two lovers, Myung-ki and Do, break up because of a secret Myung-ki’s been hiding. But When they meet again, this secret keeps transforming