As he zombifies, he thinks of the first time he held his daughter in his arms and throws himself off the locomotive with a smile. He puts Su-an and Seong-kyeong inside the engine room and shares his last words with his daughter before moving outside. Seok-woo fights him off, but is himself bitten. They encounter Yon-suk in the motorman's cab, on the verge of turning into a zombie, having been bitten when the train conductor saved him. The homeless man sacrifices himself to let Su-an and Seong-kyeong escape with Seok-woo into the train the conductor had activated. The train conductor starts a locomotive on another track but, while trying to save Yon-suk, is also killed by zombies after being pushed by Yon-suk. Heartbroken, Yong-guk stays with Jin-hee and is soon bitten by her. Yon-suk escapes after pushing the train attendant to be killed by the zombies, then does the same with Jin-hee.
In the process, Seok-woo, Seong-kyeong, Su-an, and the homeless man are separated from Yong-guk and Jin-hee. A blocked track at East Daegu train station forces the survivors to stop and search for another train.