lollilolli_
seungcheol and Jeonghan used to be a very lovely couple when they were at university. But jeonghan breaks up with seungcheol out of nowhere and leaves the university permanently without explaining anything to seungcheol.
Jeonghan's parents were very financially unstable, and his father died of sickness. That's why he leaves seungcheol and dreams of becoming a teacher, and seungcheol doesn't know any of that. Instead, he started hating jeonghan, and they never met again.
and because of the fate, they meet again when jeonghan went to a job interview to seungcheol's company without knowing, and they encounter each other again.