A sexy sister-in-law instead of a quiet wife! An innocent sister-in-law instead of a horny wife! Two men struggle with their sex lives and they decide to swap wives. Jong-woo…

Seok-yeong has been living with his father ever since his parents got divorced when he was young. His father, Joong-nam, would always introduce his new girlfriends to Seok-yeong, but Seok-yeong…