Murky boundaries

A cute younger guy, a confident sexy guy, and an able obsessive guy in a triangle romance. "You! What do you want from me?" "Romance. I would like to date you, Professor." Sangil Choi, a Korean Literature professor, has a scar from an unrequited first love buried deep within him. All of a sudden Haneul Park, an undergrad student, barges into his life asking to date him. At first, Sangil finds it amusing to tease naive and unconventional Haneul, but little by little, he becomes attracted to Haneul. Right then, his first love Seokjoong reappears in front of Sangil, asking for a second chance.