On a mission to find her husband, Yi-kyung makes a shocking discovery. The battered Ji-su and Eun-yu arrive at a new shelter, but catastrophe awaits them.

The survivors take shelter underground, where supplies run low. In her continued search for Eun-hyeok, Eun-yu encounters a young girl.

Sergeant Kim and Master Sergeant Tak clash on how to protect their men. The mysterious girl approaches Eun-yu with an enticing offer.

Hyun-su wakes up to find Sang-wook, who has a new goal for them. Lee Eun-yu and Ji-su escape a violent evacuation and commandeer their next destination.

Eun-yu chases Yi-kyung and the girl, with Park Chan-yeong right behind her. The death of survivors and a missing soldier throws the stadium into unrest.

Eun-yu finds a hint of Eun-hyeok’s fate at a stop in her journey. During an experiment, Hyun-su finds that he has a special effect on another monster.

As Yi-kyung faces death, the young girl tries to save her. In the ruins of the lab, the soldiers discover other survivors who aren't what they seem.

Eun-yu shares a terse reunion with Hyun-su. While the platoon embarks on their search for a missing soldier, the stadium experiences a monster threat.