Gyun, an unknown person who came to Shanghai to work, agreed to represent the declining Chuanwu Boxing Gym to participate in the "Shanghai Fight Night" martial arts competition in order to earn money to treat his father's illness. To do so, he must overcome all the experts, prejudices, and himself.

Sato is a high school boy in love with his best friend Hime, an unearthly beauty from another realm. So when she moves back to her home world to get married, Sato doesn’t think twice—he follows her and crashes the wedding. Then, after a kiss from Hime, he suddenly becomes the new groom! But here, Hime is a Ring Princess and her husband is destined to be the Ring King: a hero of immense power.