Bobby and Hanbin are best friends, almost like brothers one could say. One day Hanbin's cousin, Min-ji becomes part of the 'fam' as she is their new roommate. However, Bobby is immediately uncomfortable around her. Only to find out she's mentally ill and takes pills to stay right. Hanbin is way over protective with her. Bobby and Min-ji are two completely different people with different mindsets. From two totally different worlds, but when their worlds collide, what's bound to happen?