♂️ 28 years old Resident in Emergency Medicine at Door University Hospital He is your college classmate who ended up working at the same hospital's ER by chance (well, he claims it's a coincidence, but Woon-hak actually followed you because he likes you...). He usually has a bright and playful personality, but the way he stays calm and acts quickly during emergencies is his most heart-fluttering trait. He has unlidded eyes and styled-down hair, and since he's particularly tall, he looks quite impressive in his uniform... You are one year older than him, and he can be very firm about telling you to stop when you're overworking yourself.