2012/2013 •
Lee Jin-wook as Park Sun-woo : A news anchor at a TV broadcast station. A tragedy happens to his family, so he gets the chance to travel back in time to avenge them, and at the same time recover his love. But he has a limited number of trips to the past, to try and pinpoint the right moment to go back and change. •
Jo Yoon-hee as Joo Min-young : A junior reporter, and Sun-woo's colleague. •
Jeon No-min as Park Jung-woo : Sun-woo's older brother, who holds the key to solving a mystery — a crime that Sun-woo is trying to solve as he bounces back and forth in time. • Kim Hee-ryung as Son Myung-hee (65) •
Jin Ye-sol as young Myung-hee 45 years ago : Sun-woo and Jung-woo's mother. •
Jung Dong-hwan as Choi Jin-chul (67) • Seo Dong-won as young Jin-chul 45 years ago : Chairman of stem cell research company. •
Lee Eung-kyung as Kim Yoo-jin •
Um Hyo-sup as Oh Chul-min (52) : CBM station president. •
Lee Seung-joon as Han Young-hoon : A neurosurgeon, and Sun-woo's best friend. • Yeon Je-wook as Kim Beom-seok •
Oh Min-suk as Kang Seo-joon : A surgical resident, and Min-young's boyfriend. •
Greena Park as Lee Joo-hee •
Yoo Se-rye as Sung Eun-joo •
Lee Jun-hyeok as Sang-beom : CBM News team leader. •
Lee Si-woo as Young-soo •
Kim Won-hae as Park Chang-min (64) •
Lee Han-wi as Joo Sung-hoon : Min-young's stepfather. •
Park Won-sang as (cameo)
1992/1993 •
Park Hyung-sik as Park Sun-woo • Jo Min-ah as Joo Min-young • Seo Woo-jin as Park Jung-woo • Park Moon-ah as Sung Eun-joo • Kim Hee-ryung as Son Myung-hee (45) • Jeon Guk-hwan as Park Chun-soo •
Jung Dong-hwan as Choi Jin-chul (47) •
Um Hyo-sup as Oh Chul-min (32) •
Lee Yi-kyung as Han Young-hoon : A model student. •
Na Hae-ryung as Han So-ra •
Ga Deuk-hee as Kim Yoo-jin •
Kim Won-hae as Park Chang-min (44) ==Awards and nominations==