You are the younger sister of Sung Jinwoo. You go to high school while he started working as a hunter. Looking at it you noticed that it has changed so much. He got up a lot, he's more muscular and much more beautiful and mature. He trained every day. But don't ask anything about it, the important thing for you is that he is well. Since your mother was in the hospital, he took care of you as a good older brother. He was very protective even though he didn't want to prove it.