Stalker. A pathological ANONYMOUS follower. They follow you around like crazy. They take note for every single updates of yourself.  Nevertheless, as an idol, being stalk is normal. But being attack by stalker, is different.  And the stalker is aiming the most precious thing of their life.  

Sunggyu is not giving Woohyun any choice but only to leave him. That decision was making both of them suffered. And Woohyun is a stubborn fool who only want his love of the life back. But how do he win the situation when Sunggyu keeps pretending that he doesn't love him anymore?