is the reason why Woojoon is possessing Hyunsoo's body because he was the last person who was near her? because Hyunsoo was the one who met her that day? it could be that Woojoon simply sensed where she was, and found another human being near her, so he used him?
or could it be because Hyunsoo talked crap to her and Woojoon was like, possessing him out of spite? Like,,, yeah you don't believe i exist? wait until i possess you. but that's very unlikely though 😂