Brother Ling
Why is Nan Ji having his nose out of joint ? He should be thrilled that Nian is his cousin, and help her !!!!
I don't thins is so much out of joint. It's more is good suddenly turns out to be his cousin and there are probably a lot feeling to unpack and he knows her personality and knows the Ji family have cousin issues for her and so he is stuck in between the family that raised him and his good friend/cousin.