Gaewa Neukdaeui Sigan

Kiyo, a struggling young artist, suddenly finds himself pinned as the prime suspect in a serial murder case. And as if going to prison wasn't enough, he's thrown into an Alpha-only facility crawling with thirsty alphas who are all too eager to eat him up. Thanks to his mysterious new cellmate Iri, Kiyo is able to escape their clutches, but bigger problems await...
(Source: Lezhin US)
Note: Includes 13 special episodes and an epilogue.