Sunwoo moves into a suspiciously cheap apartment, only to discover it is Room 999, a place where the boundary between reality and the supernatural is blurred. He soon realizes he is not alone when he meets a mysterious ghost named Sae-ah who refuses to leave. To survive his stay, Sunwoo must navigate the terrifying rules of the building while dealing with the restless spirits that haunt the halls. Written and illustrated by Blue Gu. Korean manhwa. Ongoing.

Read Room 999 manhwa in English, updated regularly. Also known as: 999호실 · 999-hosil · Room No. 999