Nanako is the definition of a whore

According to Japanese' superstition, 7=nana is an unlucky number. "KO" sometimes mean child. So... yah you got it.

Sorry this is not true, even in Japan, 7 is considered a lucky number because it's a lucky number in Buddhism. There are things like 7 gods of luck and 7th hour, and tanabata named after #7.

I think you're referring to #4 which is symophonous to the word "death".

Also this is a chinese manhua, so it wouldn’t make sense to have a japanese superstition in there.

Bruh. She was isekaied in japanese story. Think further. Everyone in this arc pratically has a japanese name.

Indeed.

Even though she got sent to a japanese story, it’s still a chinese manhua, so it wouldn’t make sense for there to be a japanese superstition.

There will. Are you underesimating the Author's ability to make tiny bit of research? Fam, be open-minded. It would make sense and the probability wouldn't be 0.