Sun-Ken Rock Manga is a Japanese manga series written and illustrated by Boichi. The plot tells the story of Ken who dropped out of high school and followed Yumin who he loved to Korea in an attempt to be in the police force. Arriving at Korea, he found himself a failure and unable to find proper work. After helping an old man from being abused by a gang, his fighting skills and spirit earn him the attention of a gang, he later is recruited as the head of local gang led by Tae-Soo Park and made him the new boss.