Song-Yi is a young girl with black hair in a bob cut, black eyes, and a beauty mark right under her left eye. On raids, she typically wears a hoodie with a black cap, a gray skirt, and black leggings. In her second appearance, she tied her hair into a bun with a pair of fringes on each side.

Personality Song-Yi was initially somewhat rude and did not care much about her own education, as she dropped out of high school once she started making fast cash as a hunter. However, after her near-death experience in the Red Gate Incident, she became much more friendly towards Jinwoo, referring to him by his first name instead of calling him "mister," and headed back to school to finish her education, clearly believing that she was better off there. She also gained a sense of bravery, as demonstrated by how she was willing to fight against a group of bloodthirsty orcs even though she knew that she stood no chance against them at all.

History Yoo Jin-Ho Raid Party Arc When Jinho went looking for people to recruit for his raids with Jinwoo, Song-Yi happened to get roped in on his offer and decided to drop out of school after learning about how much money Jinho was paying her for standing outside a gate and doing nothing. Although Jinwoo didn't recognize her due to his unfamiliarity with his sister's friends, he was still confused as to why she was a hunter at such a young age and with such a low rank.

Red Gate Arc As Song-Yi used to be Jinah's classmate, Jinwoo eventually found out about her from her former teacher and decided to persuade her into going back to school by exposing her to the dangerous reality of the job. To that end, he reached out to his contacts in the White Tiger Guild and got both himself and Song-Yi a slot in one of the guild's training exercises. Unfortunately, things went horribly wrong when the gate that they walked into turned out to be a Red Gate, stranding them on a frozen, snow-covered landscape.