"--Uh, Latin is what the ancient Romans spoke, I have no idea what normal people know."

"I have heard of the Romans."

"Someone translated that one into Latin! This one I did myself--" And he launches into a Latin version of Cyndi Chao’s The Most Romantic Thing.

"You've got such a pretty singing voice. And you can translate songs yourself!"

"Well, sure, it's not that hard."

"I couldn't translate something like that."

"Well, how many languages do you speak?"

"Define 'speak.'"

"Uh, can read a book in with plenty of time and a dictionary."

"Just one, then, unless 'plenty of time' is enough time to learn more."

"Right! So of course you can't translate songs. You'll be able to translate them fine once you learn your second language."

"I guess? But it's still pretty cool that you can do it."

"I should translate one for you!" He starts trying to sing:

Looking through the window in those days
Watching outside those years
Never knew how blind I am
Now I'm here twinkling in the stars
Now I'm here suddenly I see
Everything is so clear standing here
I'm where I should go

"Wow that does not scan at all. Needs work."

"But you did that on the fly."

"I like music! And languages!"

"I guess you find biology pretty cool."

"Biology is also super cool!"

"So I've just got to be as good at biology as you are at languages!"

"Why?"

"So I'm not too much less cool than you?"

"Everyone is less cool than me, si-mei, if I was holding out for people cooler than me I'd be lonely forever."

"That's fair."

He sings:

You don’t feel safe, don’t know why
When you walk in the door, you are turning your head
No makeup needed to cover up
It's enough to be like you
Everyone in the room can see
Other people but you, oh
Baby you light up my world like nobody else
The way you flick your hair makes me at a loss
But when you smile at the ground, it’s not hard to tell
You don't know, oh oh
You don't know you are beautiful

As noted before, song translating is very cool.

... And this is a romance song. Is he flirting? At her? ...is he serious, and should be be doing this in public?

She's smiling and trying not to giggle and turning bright red.

Unfortunately for Chu Chu, this is an extremely rewarding response for Wei Wuxian.

Say, you just don't know how beautiful you are
Baby this is my favorite part
You walk around and don't know anything about it
Like no one will break your heart
Okay baby, look, me, I will help you cover
I want to be your lover, you may be that person
If it’s just tonight, ayyy, we don’t have to worry
We don't worry, we fall in love in a hurry