A deadly virus is sweeping through South Korea, and the air itself is infected, leaving survival a race against time. In a high-rise dormitory, Hyunjin and Felix are the only ones left, or so it seems. Both have managed to survive by wearing gas masks, but their rivalry remains as sharp as ever. Hyunjin, an ambitious alpha, and Felix, a resourceful omega, have always been at odds, competing for dominance. Now, trapped together, they must put their differences aside if they want to make it through the nightmare alive.
In the confined space of their dorms, they face the horrors of isolation, the constant threat of infection, and the haunting possibility that they might be the last two people left standing. Forced into an uneasy alliance, their rivalry slowly shifts into something more complicated as the tension between them builds. But as they grow closer, Felix begins to hide something- a secret he is keeping from Hyunjin that could change everything.
With every passing day, they question their feelings, their survival, and whether they can truly work together-or if the very air around them will take away everything they care about.