|Operates in||Nine Dragons School|
|Part I||Chapter 1|
|Part II||Chapter 2|
She is a short girl with short black hair tied up in both sides. She wears glasses. In The Breaker series she is seen with square shaped glasses while she has big circular glasses in the New Waves.
Sung Hyun approaches Sae-Hee, who was just talking with an injured from bullying Shi-Woon Yi, and tells her that she had heard rumors about a kid being bullied and that kid seems to be Shi-Woon. Sae-Hee asks her who the bullies are but she responds that she does not know since she only heard it.