I Really Don't Want to Learn Forbidden Spells - Ch. 3

[MangaDex]

 

[Kaarme]

I wonder if owing them 80 million was just randomly picked by the author or if there's some popular TV show in China where such a debt is at the center of the plot.

A piece of ancient Chinese wisdom: to impress and charm a girl, insult the girl's childhood friend, whom the girl still obviously cares about.