Son Naeun has been okay all these years, raising her baby brother Son Namjin by herself and supporting the both of them. But will a certain person change the life that she has already been used to and the destiny she has already accepted?

"Hey! Watch where you're going, mister!" she said, brushing the "stranger's" hand off, and helping herself up.

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"You again? What's your problem?!" she said. In another accident. She sighs.

"My problem? You." the "stranger" smiles.