Season 01 (S01) suggests the debut season of the series. K-dramas have seen a global surge in popularity, often blending high-concept sci-fi elements with emotional storytelling. Viewers searching for this specific title are likely looking for a complete narrative arc, typical of the concise season structures found in Korean television.

The series follows ten individuals who are invited by a mysterious figure, Lee Shin, to travel back in time by exactly one year to "reset" their lives. While some aim to prevent a traumatic accident or win the lottery, they soon realize that changing the past has a "twisted" cost.