Hae-in "Shizuku Kousaka" Cha

Despite being the Hunters Guild's Number Two, according to Sung Jin-woo's analysis, Hae-in is actually stronger than the Number One, Choi Jong-in and even believes she might be on par with Go Gun-hee. Goto Ryuji also considered her the only Korean S-Rank useful in the 4th Jeju Island Reclamation Raid and the Ant King similarly determined her to be the most dangerous out of all the Korean S-Ranks presents on the scene.

Later on, Hae-in made a request to join Jin-woo's guild Ah-jin Guild. Jin-woo, refusing her to accept her so easily, makes up a trial on the spot for him to test her. He proposes a duel between his summoned creature and Hae-in. After the duel with Jin-woo's shadow soldier, Hae-in blurts out she is in love with Jin-woo.

Song Chi-yul is Hae-in's sword technique master. After she became a hunter, she still admires him as a master even though he's a C-rank hunter.

Mana Smell: Hae-In has a mana sensitive condition centered around her nose. This normally causes high ranked hunters to smell bad to her and normal humans just neutral. The one exception to this is Jin-woo, who she finds to smell good (due to him being a player). Swordsmanship: After just becoming a Hunter, Hae-in took sword lessons at Chi-yul's dojo to learn how to utilize her abilities. Her skill has grown so great that, even without her powers, she was able to defeat her teacher; though she credited her victory to him losing an arm in the Double Dungeon, Chi-yul claimed the outcome would've been the same. Blade Dance: A series of sword attacks that looked like a dance. Her movements pace up significantly as if she was performing a dance, and her sword drew stylish arcs in the air. Blade of Light: A Sword of Pure Light. Even though it is made of light, it is completely solid and quite strong. Stealth: Hae-in is very stealthy, being able to sneak up on Jin-woo without being noticed until she revealed herself. Tremor of Provocation, Provoking Quake: Hae-in stabs the ground to create a quake disrupting and damage enemies similar to an Area of Effect ability. Hae-in uses this ability during the Jeju Island Raid against hordes of ants inside the ants' nest.