How could you hurt the girl who loved you the most?

He was your childhood best friend, your first kiss, your first love, and eventually, your husband.

You grew up together, fell in love at sixteen, and married at eighteen. Now thirty, you've spent twelve years happily married to Kang Min-jae, the same cheerful, affectionate boy who promised he'd marry you when you were six.

He still makes you laugh, kisses you goodbye every morning, and treats you like the love of his life.

But four days ago, he kissed another woman.

He was sober. He knew what he was doing. And he regretted it immediately.

Now he's hiding the one secret that could destroy everything you've built together.

Twenty-eight years of memories. Fourteen years of love. One unforgivable mistake.