Do I really need a nickname?

https://www.novelupdates.com/series/the-prosecutors-offices-proposal/ this one?

Yeah
But after chap 30 it doesnt work anymore

And after chap 30 it shows chao 67

Ohh I just realized mb mb then maybe u can try https://novelib.com/story/the-prosecutors-offices-proposal/ this one? im not sure if its completed or not but it says it is

nvm its not completed

gl on finding it tho

no you're not the only one. me and it seems like several others are facing the same issue. asked around yesterday and some shared what worked for them so hopefully it does the same for you(unfortunately it didn't work for me so I'm just gonna wait around and see)
https://www.mangago.me/home/mangatopic/22504113/