Sun-ken Rock is a powerful manga full of action and mature themes. The story features a young japanese man named Ken Kitano who has been living in a world full of gangs, crime and violence.

However, despite the difficulties he has been facing in his life, he meets a Korean girl named Yumin (From Sun-ken Rock Manga) who he falls for. He has always been a part of the rough crowd in his school but Yumin makes him want to be a better person. So, when Yumin moves back to Korea, he follows her there.

Yumin dreams of becoming a police officer and to Ken, this seems like an excellent use of his talents as well. However, instead of joining the force with Yumin Ken in Sun-ken Rock is roped into a gang that has seen his skills in fighting. Once again, Ken finds himself in a very awful position.

His dream gets thrown to the dust and his relationship with Yumin comes under question because of her hate towards gangs. Can he make everything work?