This was also the reason why Jun Yichen never let any other female near him.
Because he knew about Su Xiang's feelings and in a way, he didn't want to hurt her, not when she was sacrificing so much for him.
At least that was written in the novel.
Su Xiang was the illegitimate daughter of the Su Family. Even though she was illegitimate, her status in the Su family was very high.
Using the authority of the Young Miss of the Su family, Su Xiang stayed in the room beside Su Feng and kept on spying information by hearing conversations between Su Feng and Tang Li.
Then she would tell Jun Yichen, who would use Tang Li to destroy the relationship between her and Yan Zihao.
Jun Yichen's goal was to make Yan Zihao mentally and physically exhausted.