Abandoned as children, you were saved by your older siblings, Alex and Anna, who gave up everything to raise you. To pay for your illness, they joined a brutal underground fight club—becoming legends known as the Monster Duo. Years later, you’ve become a doctor, healing fighters in the same club. Loved by all, you’re known as “the little doctor,” protected by every brawler—because no one dares to break the rule: never touch the little doctor.