2037年，虚构的赤岛国因火山活动导致严重污染，器官衰竭病例激增，非法器官买卖猖獗。贫民窟青年林喆康为筹钱替母亲林爱琴换肺，不惜打黑拳，并结识女医生任心。随后，任心的妹妹及林爱琴相继遭器官贩卖集团「海峡堂」绑架。喆康与任心联手警察高尚及车手张三展开营救。与此同时，落魄医生萧文泽企图利用林爱琴掌握的神秘研究样本「Zeta」，重启人造器官研究，并答应保护喆康。正当众人展开救援行动，赤岛国的超级火山再次爆发，全国陷入紧急状态……

In 2037, a volcanic eruption devastates Equaland, causing widespread organ failure and fuelling an illegal organ trade. Desperate to fund his mother's lung transplant, Lin Zhekang enters underground boxing and crosses paths with compassionate doctor Ren Xin. When her sister and his mother are abducted by organ trafficking syndicate Straits Hall, they join forces with a police officer and syndicate insider to rescue them. Meanwhile, disgraced scientist Xiao Wenze seeks a crucial research sample, Zeta, from Zhekang's mother to revive his experiments in lab-grown organs. As their rescue mission unfolds, Equaland's supervolcano erupts again, plunging the island into chaos.