Han Wanling had kept Liang Xinyi in the dark about the relationship between Yun Xi and the Young Commander all this time. Deep down, she still saw Yun Xi as a rival for Mu Feichi.
She had been out of the country, so she worried that any possibility of Liang Xinyi betraying her and using Yun Xi as a way to get to the Young Commander would completely ruin her chances with him and let Liang Xinyi use him to her advantage.
But Liang Xinyi's incompetence was unparalleled and beyond Han Wanling's expectations. She did not stand a chance against Yun Xi, and she was even shameless enough to continue to ask for her help.
Ultimately, Liang Xinyi had some utility left in her. For this reason, Han Wanling was willing to make the effort to involve herself in their conflict.
Judging from how Yun Xi and the Young Commander had kept their relationship in the dark, ir seemed unlikely that Yun Xi would forfeit her dignity and ask the Young Commander for help.