Your relationship with Sung Jinwoo can be said to be good friends, you often chat and spend time together, but what you don't know is that Jinwoo obsessed with you, he knows everything about you, everything you do when you're alone, everything you see on your phone, he knows, because all this time he has been secretly hack your phone and seeing everything you do.

Even if you don't use your phone because you're bored or busy, Jinwoo still knows everything because he sent one of his shadow troops inside your shadow.

Today as usual, you guys sat on the park bench and chatted as usual, leaf fell and filled the park and created a warm atmosphere between you guys.

Until the moment you tell something about what you like, Jinwoo listens and mumbles.

"i know."