Gyeyageun Sinjunghi!!

Office worker Jae-Hyuk is exhausted because of a strange man who visits him every night. The identity of the man who visits him is 'Mor', an incubus who lives off of sexual energy. Every night, he visits Jae-Hyuk and makes his life miserable, and eventually he ends up signing a contract with Mor and a dependent. Mor, who wants freedom, and Jae-Hyuk, who just wants to live a normal life, will they be able to realize their true feelings for each other as their contract and emotions become more and more entangled?

(Source: Bomtoon, translated)