well first off you people have something wrong
artist arent like academics which have to list every possible and impossible source of every scrap of their work
as long as they arent to obvious artists are allowed to steal and copy from each other... or as they call it inspiration
and this team of artist and author are rather smart: they are chinese yet their work emulates japanese novels and manga , just look at how the style changes at first its your classic chinese/korean longstrip and it slowly changes into a style more reminiscent of japanese manga
also the mc is a mix of different tropes often used in manga or ln from japan,
especially the names: chinese and korean usualy use names that may or may not be witty or cool sounding in their own language but sound very dorky once translated just take the possibly most overrated name from cultivation novels long aotian = heavenly sky dragon omg i get goosebumps just from writing it.
is this manga copied? you can bet your ass it is
but is it plagiarism? no, far to much from too many sources to pinpoint a specific source, so as long as you subscribe to the innocent until proven guilty pragmatism you cant call it a plagiarism
also just nicking a charackter traits form a work and weaving your own story is hardly plagiarism or every greatswords mc since final fantasy would be a cloud clone