Reasons

Yeosang and Jongho broke up three years ago due to a misunderstanding that eventually caused it. Both ended each other's communication. Yeosang left for New York to concentrate on his dancing course, while Jongho moved to Seoul to start a new chapter by going to his dream university and working as a part-time barista at his cousin Yunho's cafe.

Three years passed and Yeosang finally returned home to work for his best friend Wooyoung and his fiancé San's dance studio located somewhere in Seoul. The same location where Jongho is working at.