Joon Lee

About

Species: Human
Gender: Male
Age: 21 (Episodes 1-59)

27 or 28 (Episodes 60-)
Occupation: Teacher
Student (formerly)

Barista (formerly)
Hair Color: Blonde
Eye Color: Brown

Joon's personality is easygoing and happy.

He has light hair and brown eyes. He also occasionally wears glasses, though he doesn't need to most of the time. He is often seen with a smile on his face. His personality is easygoing and happy.

(source: Devil Number 4 Wiki)