Lu Youye meant to express that no one understands men better than men themselves.
A young girl dressed like that to a party will definitely attract a lot of male attention.
What if someone sees her young age and purposefully gets close to take liberties with her? A girl who grew up in the countryside wouldn't know how dirty these high-society men can be.
Although he didn't like Lu Sheng, she was still his sister by blood. Thinking about a bunch of lecherous old men ogling her at the party annoyed Lu Youye.
"What's that got to do with Fifth Brother?"
However, Lu Sheng lifted her head and said indifferently, "Didn't Fifth Brother just say that in your heart, only Qianrou is your real sister?"
"Since Fifth Brother doesn't consider me a sister, why do you care what I wear to the party? Why would there be men's clothes in my possession?"
"You..." Lu Youye was at a loss for words, "Wear whatever you like, I couldn't care less!"