During the Beiyang period, various forces in Shanghai were intertwined. People with lofty ideals joined the revolutionary party and were persecuted by the Beiyang warlords. The Japanese assisted the Beiyang warlords in arresting the revolutionary parties. As a patriotic and passionate young man, Chen Zhen prepares to reorganize Jingwu Sect after avenging his master. Revolutionary Party Yang Yunshuang asked Chen Zhen to help rescue leader Li Guofeng after he was caught and taken into prison by the Japanese. Chen Zhen wanted to revive the Jingwu Sect and did not want to go against the Japanese, so he declined. Yang approached Chen Zhen and asked for help again after he found out the secret location of the prison. Chen Zhen knew the brutality of the Japanese and knew that he could not save him alone, so he decided to help him. The next day, Chen Zhen was taken to prison by the Japanese and was asked by Ryosuke Ishikawa to participate in the ring competition.

北洋时期，上海滩各方势力犬牙交错。有志之士纷纷加入革命党，遭到了北洋军阀的迫害，日本人也协助北洋军阀大肆抓捕革命党。陈真身为爱国热血青年，为师父报仇后，准备重整精武门。革命党杨芸双前往秘密地点与上级领导李国风接头时被叛徒出卖，李国风为掩护杨芸双撤退，被日本人抓住。杨芸双逃跑途中遇到陈真，从日本人手里逃脱。杨芸双请求陈真帮忙救出李国风，陈真因想重振精武门，不想与日本人作对，婉拒后整日教育徒弟习武强身。杨芸双打探到李国风被日本人关押在秘密监狱，而石川凉介用尽酷刑也没能拿到想要的情报。杨芸双再次找上陈真，求其帮忙，陈真深知日本人的凶残，也明白不能独善其身，决定救人。次日，陈真被日本人带到监狱，并被石川凉介要求参与擂台比武。擂台上，陈真与石川凉介打的难分伯仲，几番殊死较量后，陈真打败了石川。同时，杨芸双众人也攻入监狱，两方混战在一起……