Convinced that his father is innocent, a young detective joins a special society that can travel through time. But the leader of the society is the victim of his father's alleged murder. With almost no clues, he unexpectedly finds an envelope in his mailbox that changes his life. In the maze of enmities, betrayal and love, the detective is forced to face the dark shadows of the past while unraveling secrets. Traveling through time can change not only the past but also the future. Can the detective solve all the mysteries and prove his late father's innocence? Or will the truth lead him to even more complexity?