Cha Hae-In is a prominent S-Rank Hunter in the series 'Ore dake Level Up na Ken' ('Solo Leveling'). She is known for her exceptional swordsmanship and serves as the vice-guild master of the Hunters Guild. Hae-In is notable for her strict and serious demeanor, but she is also compassionate and deeply cares for her comrades. As the only female S-Rank Hunter in Korea, she plays a critical role in major battles and develops a close relationship with the protagonist, Sung Jin-Woo.