Vienna_Gu
4.8 stars. Everything is 5 stars except world background because it's too early to judge it and it seems like a plain modern world. I was actually shocked by the first chapter but now I've gotten used to it as romance novels seem to have much more realistic characters in it. (sorry i couldn't find 'the concubine from 21st century- english' i checked in original works and searched in the search tab, but couldn't find it. Sorry)
There were generally more grammar errors that could hinder the pace of reading and understanding. Author could go back and do some editing, especially the gender pronouns (girl=she, her hers)( boy=he, him, his). The story is nice and the characters are well made. The storyline is unique and has a lot of potential about friends and family.