This is too ridiculous to be considered nationalism and not discriminatory enough to be considered racism.
It feels like a drunken wet dream of a nationalist.
Had to google Silla Kingdom=Koreans and the other is Japanese?
Pretty overt for the first few chapters lol. Just coming straight out and saying China is number 1 ruler of the world and it’s Citizens are rich/lazy/not inclusive haha.
So I went and read the previous chapters.
1- The MC found a eye artifact which created this fog outside the bookstore and made his noght customers see him as a Demon Lord
2- The girl paid a knife and tea leaves for a book from the bookstore which is how she purged the demon from her body....