Cheng Su

Cheng Su is the real mother of Gu Nan.

Background
Cheng Su was a researcher who had been in charge of experimenting on a newly found mysterious corpse the showed no signs of decay: Qian Li's corpse. Her lover, Mo Wen, accidentally injected her with the genome of the corpse while she was pregnant. When the other researchers found out about the incident, they forced Cheng Su to stay in the laboratory so that they could experiment on the child once it was born. Fearing the future, Mo Wen created a chance for Cheng Su to escape. She safely gave birth to Gu Nan and managed to entrust the child to the Gu Family; Mama Gu originally didn't agree but after she gave them a heft sum of money, the duo agreed to take the baby in. On her way back from their house, Cheng Su was intercepted by people from the laboratory and was forcefully detained for many years. Sadly, she was slowly driven insane by the researchers during that time. After many years, he reunited with Cheng Su and left to a faraway land.