A shy math teacher time-travels back to high school to win his lost love, competing with his younger self for her heart.
Lee Jung-shin
Kang Shin-Woo
Seo Ji-hoon
Young Kang Shin-Woo
Lee Yul-eum
Han Ji-Soo
Lee Tae-seon
Shin Joo-Hwan
Cho Lee-hyeon
Baek Na-Hee
Min Do-hee
Jang So-Ra
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2017
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