My First Love

Kang Shin Woo (Lee Jung Shin), a 28-year-old mathematics teacher, is haunted by an unrequited love for Han Ji Soo (Lee Yul Eum) from his high school days. When a mysterious incident sends him back in time to his teenage years, he sees an opportunity to win her heart. However, his presence complicates matters by provoking his younger self (Seo Ji Hoon) and creating a unique love triangle where both versions of Shin Woo compete for Ji Soo's affections. Unaware that the two admirers are actually the same person from different timelines, Han Ji Soo finds herself caught between two versions of Shin Woo, each hoping to change their shared romantic past. This is a 2018 South Korean drama series directed by Min Yeon Hong and Lee Jung Hoon.