Gu Yan, a gold medal programmer, lost his loved ones and unexpectedly received the "Rebirth System" when his life was on the verge of collapse. The system allows users to rewind to specific points and try to change their fate. In order to save his family, make up for his regrets, and pursue his dreams, Gu Yan embarked on a long journey back. Every time he restarted, he thought he could change the past, but gradually he discovered that every choice would produce new bifurcations and costs. The number of rollbacks is affected by system rules and cannot be unlimited. The growth, love, hate, and betrayal in each life bring Gu Yan closer to his true self, until a certain reversal breaks the bottom line of the system and triggers a greater crisis. In the end, he has to make the final choice between protecting family, love, life ideals and free will.