Jae-Gyeong Joo

An undefeated legend of the Mixed Martial Arts fighting championship. He is a tyrant in the ring and also known as the strongest man in the world. Jaekyung revealed to Kim Dan that he has an unfortunate jinx that causes him to lose in a competition whenever he does not have sex the night before. Calling him repeatedly to have him accept the contract, Jaekyung sees Dan as a way to continue winning in the fighting ring.