"Yeah! We have to take it slow, and I heard last night she had a fight with Jin Shu and Jin Zhenyu, so, we have to handle it carefully." Jin Boyuan had heard that information from someone who wasn't amongst the troup Jin Zhenyu had in that Clubhouse.
They haven't met and questioned him to understand what they were up to. They knew she was with Mu Yunchen all the time, why were they attacking her? What were the reasons for approaching her? Zhou Yuxi was very resistant when it came to acknowledging families, and after finding out how she has been in that Zhou family, he understood why she didn't have many expectations of relatives and families.
"They had a fight? I don't know if it's enmity or just hatred they have against each other. But my brother should learn to differentiate between Zhou Yuxi and Third Master Mu. The person he is fighting against when it comes to business is Third Master Mu and not Zhou Yuxi.