Choi Eui-Hyun and Jung Min are friends with benefits. They have casual sex and still be friends. Min’s distinct sleeping preferences may be the secret ingredient in their 9-year relationship, which began as classmates and has now evolved into coworkers. Eui-Hyun frequently struggles with Min’s enormous demands as someone who has never needed a safe word for anything in his life. Meanwhile, Min is occasionally disappointed by the amount of persuasion Eui-Hyun requires to get kinky with him. But they’ve already been together for nine years, so what’s another nine? Will their differences eventually push them apart, or will they find a way to work together?