Sinimugidam

Kang Min-Seok, the youngest kitchen staff member at the restaurant Black Hundred, is unexpectedly asked out on a date by designer Yun Ji-Ho at a broadcasting station where he's working as a food styling assistant. Min-Seok, entranced by Ji-Ho, who resembles his favorite, shares a meal with him and is drawn into Ji-Ho's strange power, ending up spending the night with him at a hotel. Ji-Ho, confused, demands, "Give me back the energy you stole." Min-Seok, who hurriedly flees, is suddenly attacked by Hee-Gong, the owner of the restaurant and his close friend of 10 years. Min-Seok learns that these monsters are approximately 1,000-year-old demons who need the energy he carries in their stomach to ascend to heaven and become dragons... ?!

(Source: Ridibooks, translated)