Turns out, both.
This was a pretty good story about a Chinese-American girl, Rachel Chu, living in New York whose live-in boyfriend has somehow managed to conceal the fact that he is a multi-billionaire for two whole years. (This is in total juxtaposition to literally every other billionaire-boyfriend book out there, where the BB is weird and controlling and very flaunty of his wealth, so Nicholas was actually quite a sympathetic character in this respect).
Then Nicholas invites Rachel back to Singapore for a friend's wedding. They fly first class and he *still* doesn't tell her he's a gazillionaire (he explains away the first class tickets by saying he got them with air miles. I know next to nothing about air miles, but I do know that New York to Singapore first class would take a number of air miles so high that a high enough number hasn't been invented yet).
Then they arrive in Singapore, and he still doesn't tell her.
Then they go to see his grandma in her 64 acre estate and only then does this PhD-educated college professor start to realise that her boyfriend might be a bit rich.
So far, so ridiculous.
in fact, the rest of the book is pretty ridiculous too.
But it's ridiculous in a fun, silly way. This book doesn't take itself seriously at all and if you like reading stories about how intensely rich people spend their money, how much designer shit costs, and how rich people have problems too (hey, having to cram all your thousands of designer dresses into a three-bedroom flat is PRACTICALLY THE SAME as being homeless) then this is the book for you.
Spoiler Alert: you will learn literally nothing about Chinese (that is normal Chinese) culture in this book, but you will learn an awful lot about a bunch of clothing designers.
I had great fun reading this book and although it could probably have been shortened by about a hundred pages and not really lost any plot I really enjoyed it. The only real issue I had with this book really was that I read it on a Kindle and the author has loads and loads of footnotes positioned at the end of a chapter, so it made it really difficult to flick back and forward to see what the meanings of some of the language and cultural references meant. Not really the book's fault, but something to be aware of.
I read roughly one book like this a year and it satisfies my Kardashian Kwotient for the next twelve months. I'm pretty glad that my Rich Trash book for 2018 was this one.