-Set 6 months after the Hyosan outbreak, the virus mutates again — faster, deadlier.
-Survivors like On-jo, Su-hyeok, and Nam-ra face choices no teenager should.
-The military is secretly experimenting on "halfbies" — hoping to weaponize the infection.
-New characters are introduced. Old ones return… changed.
-Cheong-san? Alive? But at what cost?
-The line between human and monster blurs.