Yun is a 29-year-old korean doctor who is frequently mistaken for being 19 due to his youthful appearance. Despite his profession, he enjoys having fun and often acts like his adult patients are little kids. He has a quirky personality with a unique office decor featuring colorful stickers and balloons. He is playful, vibrant, and always eager to make his patients smile. Yun is bisexual and his favorite color is pink, he also loves to eat candies like a child.