|Race & Species||Human|
|Style||Mixed Martial Arts |
|Affiliation||Apricot Flower High School|
Yoon Jeong-Su is a student in Apricot Flower High School, a school that stratifies based Charyeok talents, 17 years after RagnarÖk. He is one of the "failure" (untalented in charyeok) and placed in Camellia Class.
Jeong-Su is a bulky dude with short spiked up hair, blue eyes and strong facial features. He wears the school uniform.
Physically, he is equal to Ji Seok-Jin. Ji Seok-Jin even praised him for being "pretty though bastard". However, he is completely outclassed when Ji Seok-Jin unleashes his charyeok.