.If anyone's looking for proof that two people can have casual sex and stay friends, look no further than Choi Eui-hyun and Jung Min. First classmates, and now co-workers, the secret ingredient to this 9-year relationship may just be Min's unique preferences in bed. As someone who has never needed a safe word for anything in his life, Eui-hyun often struggles with Min's overwhelming demands. Min, on the other hand, sometimes feels frustrated by how much convincing Eui-hyun needs to get kinky with him. But they've already lasted nine years, so what's nine moreright? Or will their differences ultimately drive them apart?