battleground is a Manga/Manhwa/Manhua in (English/Raw) language, Action series, english chapters have been translated and you can read them here. You are reading battleground chapters on https://mangabtt.com, fastest updating comic site. The Summary is
[PUBG UNIVERSE] In order to find a missing assemblyman, Cheon Hoyoung, a member of the National Intelligence Service, participates in an illegal battleground murder game. Survival action between 100 death row inmates.