Jun-Su, a public health doctor serving his mandatory term at Songhwa Prison, thought his assignment would be dull, routine checkups, a few minor injuries, nothing more. But on his seventh day, the world literally collapses. A mysterious nationwide sinkhole disaster swallows cities whole, cutting the prison off from the outside world. Now trapped inside a fortress filled with men more terrifying than demons, Jun-Su has only one thought:
 “I have to get out of here.” 

Clutching a stolen keycard, his only ticket to freedom, he makes a break for it. But before he can escape, he runs into the infamous Lee brothers, Tae-Hyeong and Tae-Mu, cold-blooded criminals whose names alone strike fear even among inmates. 
“What a feast. Lick it clean.” 

With monsters above and monsters within, Jun-Su’s fight for survival turns into a chilling game of instinct, trust, and the brutal will to live. (Source: Lezhin US)

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