- Cast: Moon Gayoung, Yeo HoiHyeon
- Synopsis: “Someone elses misfortune is my happiness and vice versa.” The people currently in their 20s might be the age group who have internalized the concept of competition the most. Everything was evaluated in schools and they hid notes from each other to get better grades and go to better schools. How would they engage themselves in romantic relationships? What if your lover becomes your competition? The understand of bittersweet waltz.