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One cold winter, Hee-tae is diagnosed as terminally ill. He receives a letter from his ex-wife who divorced him and left 10 years ago. She wants their son, who Hee-tae never saw, Min-sang's name to be registered under Hee-tae's family registry for a stable life.

Sadou tells the story of Atsurou Tanaka, a man who is ambivalent about visiting the sauna until one day he is turned on to their charms by the mysterious Mushi-Z ("Steamy-Z"). Atsurou develops a passion for saunas, and he travels...