It is a romantic melodrama about a woman whose life goes downhill after finding out about her father's affair and falling in love with his mistress's son.

Woo-joo plans to take revenge, but she falls in love with Dong-jin, the son of the mistress of her late father.

After enduring heartbreak and solitude, his life changes when he meets Shim Woo-joo, a woman burning with a desire for revenge.

He grew up under strict parents and has deep connections with Shim Woo-joo, forming a bond where they share all their secrets as a best friend and familial-like relationship.

However, Min-young regrets the end of her relationship with Dongjin and moves back to the house across from his, where she used to live before studying abroad in the United States.

She makes efforts in various ways to connect Dong-jin with Woo-joo, and at the same time, she approaches Su-ho, who works as a security guard at the bank.

He decided that studying for the civil service exam wasn't suitable for him, so he quit and started earning pocket money through part-time jobs.