Swallow is the ancient boss monster of the unbeatable Ancient Core dungeon, one of the seven malevolent dungeons no raid party has ever conquered. He just wants to laze around as a NEET and sleep in peace but humans keep showing up at his doorstep forcing him to deal with them. Written by Reltree, illustrated by SHIHYUN then Orisin. Korean manhwa. Fully completed.

Read Mr Devourer, Please Act Like a Final Boss manhwa in English, fully completed. Also known as: 보스 몹답게 행동하세요, 스왈로우 씨! · Boseu Mobdapge Haengdonghaseyo, Seuwallou Ssi! · Act Like a Boss Monster, Mr. Swallow! · The Unbeatable Dungeon's Lazy Boss Monster