Gu Yuan was about to leave when Zhongli Yuanjing suddenly asked, "How much of your actions towards Yun Ran are utilitarian, and how much are genuine?"
Zhongli Yuanjing is a person who values causality deeply. For this reason, he usually does not show a good face to those with poor Life Charts or those entangled in causality.
Moreover, he has no intention of changing his principles, which effectively filter out a lot of terrible people.
However, Yun Ran is an exception, not only because she saved their lives, but also because she could heroically sacrifice her already limited Merit.
As a member of the Xuan Sect, he knows better than anyone that for someone with a Heavenly Abandoned Fate like Yun Ran, who wants to live like a normal person, Merit is one of her few sources of confidence.
Yun Ran being willing to disperse all her Merit just shows how precious her character is.