Intro. Jinah was born about 15–17 years before the events of the main act of Sung Il-Hwan and Park Kyung-Hye. Ten years before the first Double Dungeon Incident, her father was considered dead when he disappeared into a dungeon in a mysterious way during a robbery. Six years later, her mother suddenly developed symptoms of eternal sleep and fell into a coma shortly afterwards.
Since both parents were no longer there, Jinwoo Jinah had to raise her place and take on the role of the family nutrient. Although Jinah was part of her part and got top marks at school, her brother proved to be an incapable hunter and would have almost died in almost every raid in the following four years. Therefore, she was worried about him when he went to work and finally prepared to break off school and look for a job if Jinwoo was ever so seriously injured that he could no longer eat them.