Barcelona, Spain. Adrián Doria, a young and successful businessman accused of murder, meets one night with Virginia Goodman, an expert interrogation lawyer, in order to devise a defense strategy.

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.