Soo-hyun comes across magical pills that allow him to go back and forth in time. 30 years to the past, young Soo-hyun meets future Soo-hyun and learns that his girlfriend will soon die because of him. In order to save her, the two Soo-hyuns try to change the past together, but a completely new and unexpected past is formed that leads to a new future.
Kim Yun-seok
Soo-hyun
Byun Yo-han
Young Soo-hyun
Chae Seo-jin
Yeon-ah
Kim Sang-ho
Tae-ho
Ahn Se-ha
Young Tae-ho
Park Hye-su
Soo-a
Kim Ho-jung
Song Hye-won
Kim Sung-ryung
Yeon-a
