A loose remake of Wang Ping’s 1958 spy film The Eternal Wave, Billy Chung’s Eternal Wave follows Communist resistance fighter and political commissar Lin Xiang (Aaron Kwok) who in 1937 is sent to Japanese-occupied Shanghai to rebuild the resistance network in the city, after it was near-dismantled by a Japanese raid on its secret headquarters. There, his cover is that of a businessman, and He Lanfang (Zhao Liying) a comrade from the Communist underground is to pose as his wife. Using radio telegraphy to circulate information, Lin slowly solidifies the network again, but he soon comes  under suspicion from Japanese Intelligence officer Masako (Zhang Lanxin) and Chinese traitor Qin Fengwu (Simon Yam).

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