C1935 Xianshan Village
That was because he saw Shen Changsheng hand over the split strand of his soul into Shen Shu's hands.
In other words, the one controlling his life and death was no longer Shen Changsheng, but Shen Shu.
Towards someone who could control his own life and death, Ding Shuheng had to be respectful even if Shen Shu was just a mortal