Vanness is weak for Ding. Vanness is the translator, the one who's fluent in English & Chinese.
Ding is weak for Danzel. Ding's English skills are going to skyrocket in coming episodes. He has a giant brain, and he's highly motivated to get better at communicating with Danzel
Danzel isn't weak for anyone, but he gets insecure when the other two talk to each other in Chinese. He feels a bit excluded. He's used to being the centre of attention.