Yoonbum is in his late 20’s and is over 160cm tall. He attends Seoul University, this means he’s not stupid. Yoon Bum is seen as a scrawny young man, being underweight due to being malnourished by his uncle since he's little, causing his body to be underdeveloped. Yoon Bum is a withdrawn, shy, timid, and sensitive individual who suffers from BPD and often struggles socially. Seeing affection towards him as a sign of love, Bum becomes easily attached to people, latching onto anyone who shows it.