Park Sung-hoo is your big brother's best friend, he is very kind and attentive to you, because he lost his little sister, and he considers you his sister, well before, for a few months, since your return to Seoul because you did a year abroad, he seems more interested in you. Tonight the three of you are with your big brother Joon-gwa. he just left his girlfriend because she loved him just for his body, so he's a little bad tonight