Su-an

Su-an is the deuteragonist of Train to Busan.

She is protrayed by Kim Su-an.

History
She is Seok-woo and Nayoung's daughter, but they divorced. Although she doesn't like it, Su-an is used to her father's little presence with her because of his work. She got a Wii from her daddy, which was the same gift from children's day. She also forgot a part of the Hawaiian song "Aloha O'e" that she performed at her school recital although her father watched the recording of the recital. For her birthday, all she really wanted to go see Nayoung in Busan.

Seok-woo then, against his better judgement, takes her via a KTX; where an infected woman is. Onboard, she meets Sang-hwa & Seong-kyeong, a wife and husband, when she wanted to go to the toilet. She and her father then notice the panic that sets in and both go in a car where she finds Sang-hwa and his wife. With the train stopped at Daejeon station, Seok-woo takes the east exit with his daughter. When she learns that the passengers will be in quarantine, she wants to warn them, but Seok-woo replies that now it's everyone for themselves. Sad, she tells him that he only cares about himself and it was because of his selfishness that her mother left him. At this moment, the army supposed to protect the passengers, is revealed to be infected and attacks everyone. Su-an is separated from her father and is in a group with Seong-kyeong, In-gil and the homeless man.

Back on the train, the four must hide in the bathroom. Su-an uses Seong-kyeong's phone to ask Sang-hwa to come and help them. The latter save them with Seok-woo and Yong-guk and are then chased by the zombies. The passengers in the other car prevent them from entering, which worries Su-an who begins to cry. However, they manage to get in and Sang-hwa and In-gil die in the process.

Rejected by the passengers, the group went to the hall and witnessed the latter's death. After hearing the conductor who said he'll change of locomotive, the group leaves the vestibule at East Daegu station. Then, a train collision gets Su-an, her father, Seong-kyeong and the homeless man stranded. They notice infected passengers in this wagon and the homeless man sacrifices himself so that the three others can flee in time.

The three then run to the locomotive launched by the conductor and find Yong-suk, infected. After a brief fight, Seok-woo throws him off the train but he is infected too. He places Su-an and Seong-kyeong in the main cabin and says goodbye to his daughter who refuses to let him go, but is ultimately forced to when Su-an, who is holding onto her dad's arm, makes her let go. She tries to get her father not to abandon her by trying to go with him, but Seok-woo closes the door. Su-an then starts banging on the door and sadly yelling stuff like "Daddy!", & "Don't go!", but Seong-kyeong keeps on hugging her whilst crying herself just so she can let her father go. Seok-woo, who is thinking about the birth of his dauhter & in the process of becoming a full fledged zombie, jumps off the train with a smile while Su-an just screams for her papa & Seong-kyeong hugs her. This action leaves both Su-an and Seong-kyeong to continue the road to Busan on their own. When the two girls finally reach their destination, they get off the locomotive due to a blockage and go through a tunnel, where on the other side, military snipers are prepared to fire. While the pair are walking, Su-an finishes the song she wanted to sing for her father while clinging onto Seong-Kyeong and the two are finally rescued by Korean soldiers. It's unknown what happened to both Su-an and Seong-kyeong, but it is assumed they made it to Busan and escaped at the beginning of Peninsula.