Master Fu being the guy who seems like hes avoiding questions but is actually getting you to realize something deep and important.
Like Marinette is like asking him about superhero stuff, maybe how shes really stressed about keeping her identity from Chat, and Fu is like making tea and she’s like “Are you even listening?” and Master Fu hands he a cup of tea, telling her to drink it.
So she does, and then she notices the tea leaves have formed a sentence at the bottom of the cup:
“CHAT NOIR IS ADIREN WHY AREN’T YOU TWO DATING YET??”