Can an affair be innocent? Seven years ago, Park Yoon-jae left Shin So-hee, the love of his life, for reasons she never understood. Now, fate brings them together again. Yoon-jae is trapped in a loveless marriage with Ae-rin, while So-hee has a boyfriend of her own. But their old feelings return, along with the desire they tried to bury. Can they cross the boundaries of marriage and loyalty? Will So-hee forgive him, or will their love remain an affair they can never have?

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