C306 The Big Ending
It just so happened that Jian Chengtian had been very busy with work during that period of time. He didn't spend much time at home, so whenever Jian Chengtian came back, Wansu would give him hallucinogen, making him think that they were sleeping together.
So Jian Wei and Jian Qingtian were Wansu and Gu Feng's daughters