"Han Seo Jun is a major character in the popular Japanese manga ""True Beauty."" He is a high school student with a rebellious streak and a troubled past, which adds depth and complexity to his character.

Seo Jun is first introduced as a tough, brooding outsider with a bad boy image. He has a pierced ear and wears a leather jacket, which sets him apart from the other clean-cut students at his school. Despite his rough exterior, Seo Jun has a sensitive side that is gradually revealed as the story unfolds.

Seo Jun is particularly close to the main character, Lim Jugyeong, who he sees beyond her mask of makeup and recognizes her natural beauty. Seo Jun often takes Jugyeong under his wing and tries to help her navigate the social dynamics of their high school. He is protective of her and is willing to go to great lengths to ensure her safety and happiness.

One of Seo Jun's defining traits is his passion for music. He is a talented guitarist and singer, and often performs at local bars and clubs. His interest in music is a way for him to escape from his troubled family life and find solace in something that he loves.

Despite his close relationship with Jugyeong, Seo Jun struggles with his own personal demons, which include a difficult family situation and a past romantic relationship that ended badly. These issues often lead Seo Jun to isolate himself and feel insecure about his place in the world.

Overall, Seo Jun is a complex and fascinating character in ""True Beauty."" His tough exterior and bad boy persona belie a sensitive and caring young man who is struggling to find his way in the world. His interactions with Jugyeong and the other characters in the manga demonstrate his depth and complexity as a person."