Ken, a man orphaned early in life due to his family's Yakuza ties, transforms from a high school troublemaker into the accidental leader of a local gang, the Sun-Ken Rock Group. His sole inspiration? His unyielding love for Yumi, a classmate who aspires to join the police force in Korea. Determined to be by her side, Ken embarks on a journey to follow her path, all while concealing his newfound role from the woman who captured his heart.