SYNOPSIS

Kang Shin-woo is a math teacher with handsome looks. He has not forgotten his first love, Han Ji-soo, for the past 10 years and regrets not confessing his feelings. By chance, Shin-woo travels back in time and meets his younger self. He is determined to help the younger Shin-woo realize his love. Things get complicated when Ji-soo develops feelings for the older him.