Jeong-In Yoon

About

Alternate Spelling: Jung-In

Yoon Jeong-In is in Class 1-8 of Seonhyun High School with Ham Dan-I. He is from Seokbong Middle School, and was one of the Four Heavenly Kings of Seokbong.
He has been class president for nine years, and becomes the official class president of Class 1-8 after Dan-I gives up her temporary role.

(Source: Inso's Law Wiki)