Sangun: Mud face mask with Geum-Sun (Patreon)

Geum-sun is a fellow exorcist who actually brought Sangun to the exorcist committee in the first place. She is actually older than him (she's aged 250 while Sangun's aged 102) and she's a goblin who used to be toad. She acts like a older sister type to Sangun, despite Sangun's stubbornness to admit it.