Immortality and Immortality Start with Marrying a Wife

Gu Changsheng came to the world of immortal cultivation. Accidentally time travel into the body of a useless middle-aged man. In desperation, he can only accept the reality, marry a wife and have children. But who would have thought that on the day of getting married, the system would be activated, and it would be a flourishing system with many children and many blessings...