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.
Elenco: Han Hyo-joo , Park Hyung-sik , Jo Woo-jin , Park Joo-hee , Lee Ji-ha , Bek Hyun-jin , Park Hyung-Soo , Han Da-sol , Park Hee-von , Moon Ye-won , Kim Young-woong , Na Chul , Cha Soon-bae , Lee Ju-seung , Han Jun-woo , Yoo Ji-yeon , Bae Hae-sun , Kang Han-saem .