The Final Boss Became A Player is a Manga/Manhwa/Manhua in (English/Raw) language, Action series, english chapters have been translated and you can read them here.
A game that just started closed beta testing was hacked by a mysterious AI, turning a relaxing and pleasant adventure world into an inescapable monster pit. Affected by the AI, the final boss became sentient and swore to protect its own game and return it to its former glory!