Blood on the wall

Hyung-geon is a painter whose recent success has him more in demand than ever. While working one day, he decides to scribble on the wall, thinking that it may spur some inspiration. Little does he know that he has created something that seems to have come alive… Does this have something to do with his persistent nightmares? As he struggles with this strange phenomenon, things get more complicated as a guest arrives to his studio…

(Source: Lezhin X)