"YOU can be your own best friend or YOU can be your own worst enemy!" Shin Woo (Lee Jung-Shin) is a math teacher who regrets letting his first love Han Ji Soo (Lee Yeol Eum) go 10 years ago because he didn’t have the courage to confess then. However, he gets the chance to win her again when he travels back in time by accident, and this time he’s armedwith the knowledge that she liked him back then too. Unfortunately, he has a strong competitor: himself from ten years ago. There, he meets his younger self (Seo Ji-Hoon). The present Shin Woo and the past Shin Woo engage in a fierce (and probably funny) rivalry to win their love’s heart.
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