龍王帰還~清掃員の父が世界を震わす~

For twenty years, the most powerful man on Earth has mopped floors and cleaned toilets, all to raise his son in peace. When his future daughter-in-law humiliates his family on the wedding day, his phone rings. And the man holding a mop reveals he owns everything she ever wanted. The wedding is off. The Dragon returns. And hell comes with him.