*History*

Prior to the scenarios, Shin Yoosung lived with her parents and pet dog. During Main Scenario 1, she killed her dog to survive. At some point, possibly in the first scenario itself, her parents died. In the next few scenarios, Shin Yoosung survived on her own through various means. She stole a coat from an old man who fell to an attack, killed a woman who used to look after her in order to protect her green zone, and gave over a person being hunted by someone in exchange for food.[3] Her location during these first four scenarios is unknown, though she eventually ended up with a group of wanderers living close to the south of Han River, near Yeongsan-gu, where she was found by Kim Dokja.[4

Shin Yoosung is one of Kim Dokja's and Yoo Joonghyuk's party members, and Kim Dokja's sponsored Incarnation. She is a character from the original Ways of Survival, and the child whose 41st round adult self appeared in Main Scenario 5 as the Disaster of Floods.

Main Scenario 5

Shin Yoosung's first appearance is when she approaches Kim Dokja to thank his group for providing food to some people in Main Scenario 5. Dokja asks her about her parents to which she replies that they're gone. She returns at night to give them a blanket as she was worried if they were cold. She is stopped from leaving by Han Sooyoung who notices that she is the Disaster of Floods. She accuses Dokja to be a hypocrite when he did make a move and decides to kill Shin Yoosung herself. That plan is quickly discarded after Dokja and Yoo Sangah say they don't want to kill her.

Shin Yoosung overhears Kim Dokja telling Yoo Sangah about her being the fifth Disaster and asks Kim Dokja if she is a bad person in the future. She also says she's always been a bad girl because of her methods of survival. Kim Dokja decides to sponsor her Growth Package I, Growth Package 2 and a New Scenario Commemorative Package and asks her if she would sign a Sponsor Contract and become his incarnation and she agrees, becoming his incarnation.

Kim Dokja then stages a crisis, deliberately letting himself get injured in the Han River, to stimulate Shin Yoosung's awakening. She successfully evolves and receives the attribute Beast Lord.

After crossing the river, they meet up with Han Donghoon and Lee Gilyoung. Lee Gilyoung and Shin Yoosung bicker about who's more important to Dokja and who knows more about Dokja.

Main Scenario 8

When opening her lootbox, she received an Ancient Beast's fruit - an SSS-grade item.