Ji Min-hyuk

Yoo Bin always considered himself to be a simple man with simple dreams. Wanting nothing more than to settle down and enjoy a life of wedded bliss, Yoo Bin was more than ready to put his days as a bachelor behind him. But when his friend, Sang Bum, convinces him to join him for one more wild night on the town, Yoo Bin can't seem to find a way to say no. Following Sang Bum to a club, Yoo Bin is soon caught up in a night of wild abandon.

Ho Goo-hee, a high schooler and self-proclaimed pushover, discovers a new application on her phone that offers to take revenge on anyone whose name she writes in it. (wikipedia)