Imaemangnyang

The word "Imaemangryang" refers to all the monsters of the world. "Seobang," the Imaemangryang who protected Jeongjo, sets out to prevent a disaster that has awakened after 300 years. To do so, he must protect "Han Yu-Jeong," a woman with mysterious powers... A bloody battle begins between Imaemangryang, who have adapted to the modern world, including goblins, maegoo, Jangsanbeom, and Du-eoksini. (Source: Lezhin, translated)