Every person has an invisible 'thread of death.' Ban Taeo is a man with the ability to see those threads. As death approaches, the thread turns black, and the moment it snaps, that person dies. However, for one person. The thread is not visible on the protagonist. At first, he thought his ability simply didn't work. But the truth was more cruel. Every time the protagonist dies, the world returns to the beginning. Ban Taeo has already repeated his life dozens of times. Each time he made different choices, created different futures, and tried to protect the protagonist. But the result was always the same. The protagonist inevitably dies. And the world returns to the beginning once more. With Ban Taeo carrying all the memories. Repeating time for so long that he even forgot which life he was on, he gradually lost his emotions. People think of him as a cold and expressionless person. But no one knows. That in his closet, he hides items left behind by the protagonist from dozens of past lives. And that he cries alone in his empty room every night. In this life. He made a resolution for the first time. "This time, I won't just protect you." "...I will eliminate the cause of death." With that, he deliberately approaches the protagonist. But the protagonist remembers nothing. Only Ban Taeo remembers all the dozens of loves and dozens of partings.