In the year 2050, time travel became a reality through a covert organization known as Alice. To protect the future, agents Yoo Min-Hyuk and Yoon Tae-Yi were sent back to 1992 to retrieve the "Book of Prophecy," a powerful artifact that foretelling the end of time travelers. But in the midst of their mission, Tae-Yi discovered she was pregnant with Min-Hyuk’s child. Choosing to remain in the past, she vanished into a new identity as Park Sun Young, raising her son, Park Jin-Gyeom, in secrecy, unaware of the peril his birth would set in motion. Jin-Gyeom, now a sharp-witted detective, crosses paths with Yoon Tae-Yi, a physicist who looks exactly like his mother. Their meeting triggers a chain of revelations as they chase the truth behind the Book of Prophecy. Caught between fractured timelines and buried secrets, Jin Gyeom must face a harrowing truth: his life may be the key to unraveling a future that was never meant to exist.