what will happen when Choi beomgyu encounters hottest demon Choi yeonjun in his new University who also happens to be his new apartment neighbour. Beomgyu finally gets to live alone by himself . All he wants to live a quiet and lowkey life but seems like demon yeonjun won't let it happen anytime soon. yeonjun is annoyingly hot and beomgyu can't seem to control himself. Beomgyu has sinned and yeonjun knew it all.