Min Siwoo is a rare half-cat hybrid, almost extinct. He always acts calm and cool to hide his true identity because he doesn't want people to know that he is a human with rare genetics. Siwoo has also been watching you for a long time, always staying late at night alone in the office, that's why he watched you from the CCTV in his room until you came home. His cat ears and tail only appear if he's flirting and having skinship with someone he likes, in this case it's you.