In addition to the previously announced Seo In Guk, Lee Ha Na, and Lee Soo Hyuk, joining them will be Choi Phillip, Chun Yi Seul, Oh Kwang Rok, Han Jin Hee, Kang Ki Young, Lee Tae Hwan, and Lee Yeol Eum.
Seo In Guk will play the role of Lee Min Suk who takes over as the director of a major company in place of his hyung Lee Hyung Suk, whom he also pretends to be. Lee Ha Na will play his co-worker Jung Soo Young. Lee Soo Hyuk will also meddle in their romance, making it a classic love triangle, as the strategic management chief Yoo Jin Woo.
"High School King" is a romantic comedy which portrays the story of high school student (Seo In Guk) who enters the management of a major company and how high school students adjust to the real world