What kind of personality is Mr. X?
In fact, this Mr. X is the adult Shen Zhizhen saw when he was a child. In the Korean drama version, this personality is Shen Zhizhen's biological father. Because Bai Xinxin was born before his wife got married, for the sake of Bai Xinxin's mother's ability to manage her family group.
What is the relationship between Mr. X and Bai Xinxin?
Shen Zhizhen's father had to accept Bai Xinxin, but later abused Bai Xinxin.
And all this was seen by Shen Zhizhen, so he was stimulated.