Because Su Shun was the first of the eight ministers who took care of life, and she had a problem with Cixi before, at that time, when Xianfeng was alive, Su Shun reminded Xianfeng not to let Cixi accompany him in politics. These Cixi actually knew it, so she hated Su Shun.
When the British and French allied forces attacked the Qing Dynasty, Cixi and Su Shun were already in conflict. At that time, when they fled, Cixi took a bad carriage, and the carriage was always bumpy on the road. Cixi was very uncomfortable, so she sent someone to tell Su Shun. Su Shun only said that he would go and see if there was a good carriage, but until the end, she didn't help Cixi change to a carriage. From here on, Cixi disliked Su Shun very much.
Later, because Cixi gave birth to a son for Xianfeng, and Cixi did give Xianfeng some court advice, Xianfeng liked Cixi very much, and Su Shun reminded Xianfeng that he could follow the example of Emperor Wu of the Han Dynasty. At that time, Emperor Xianfeng liked Cixi very much, so she asked Cixi to grind ink for him and give her a reference memorial. Cixi gave Emperor Xianfeng some advice. Anyway, Emperor Xianfeng was very happy, but at this time, Su Shun said next to Emperor Xianfeng that the harem could not be allowed to participate in politics, saying that Cixi was actually ambitious and impure, and even wanted Emperor Xianfeng to follow the practice of "killing his mother" by Emperor Wu of Han Dynasty, but Emperor Xianfeng still couldn't bear it. However, all these were known by Cixi, so Cixi hated him so much, and after Xianfeng's death, she kept trying to get rid of Su Shun.
Later, Cixi joined forces with others to get rid of Su Shun, and it was cruel. In fact, it was also to make seven ministers from other places fear Cixi and establish their own dignity.