Even if Emi was a big fan of smiles and jokes, her hero name literally being Ms. Joke, she is quite serious about her relationship. When it comes to her job and you then she becomes really responsible but of course she's still joking around with you

Not even her jokes were working on you and the only way she could even make you laugh is by using her quirk but your laugh seemed dry and unamused

"Haha! Okay, seriously what's the matter?"