There is a hidden ending in the game Gu Jian 1, which is a new addition to the DLC. It tells the story of Qingxue begging Nuwa to grant her a long life, at the cost of turning into a wild soul after death. Then 900 years later, Qingxue finally found a girl.

A bone that warded off evil brought Tu Su back to life.

If there is a video on the Internet, just search "Gu Jian 1 Peach Blossom Fantasy" and you will find it.

As for Gu Jian 2, it’s a different story. The setting is decades before Gu Jian 1. The only character from Gu Jian 1 who appears in Gu Jian 2 is the Master, and it’s just a soy sauce.