The apartment complex is now without electricity. Sae Bom and Yi Hyun find traces of an infected person inside Building 101. Who could be infected? The residents suspect others of being infected and wait for the lockdown to end. Meanwhile, Tae Seok makes a decision knowing that the antibodies may be inside Sae Bom.
Casts:
Han Hyo-joo, Park Hyung-sik, Jo Woo-jin, Lee Jun-hyeok, Park Joo-hee, Baek Hyun-jin, Back Joo-hee, Moon Ye-won, Park Hyeong-su, Jung Woon-sun, Bae Hae-seon, Cha Soon-bae, Han Jun-woo, Park Hee-von, Na Chul, Kang Han-saem, Kim Young-woong, Lee Ji-ha, Lee Ju-seung, Han Da-sol