Manga by author Lee Jong-kyu

Yonggi had sworn not to fight anymore since the death of his teacher. It doesn't stop him from protecting the weak while trying to hide his true strength. But when Gihoon, an old associate of Yonggi, drives him in the world of illegal fights, the young man will suddenly be forced to review his principles...

In the modern age, there remain many martial art clans from long ago, all of which are vying for power. Amidst a fight, the son of a security man meets a mysterious girl who kisses him out of the blue...