The Legendary Lackey(2016)

Original title: 전설의 셔틀

Kang Chan transfers to Myungsung High School in Busan from Seoul. Tough students at his new school hear the rumor that Kang Chan fought against 17 other students in Seoul. New student Seo Jae-Woo also transfers to Myungsung High School. He came from the same high school as Kang Chan.