White Day: A Labyrinth Named School - Horror Costume: Dal-Su Son

Why should the spirits haunting Yeondu High School have all the fun? Equip the Horror Costume Set to kit out the janitors with nightmarish outfits – and don the students with survival uniforms. Trick or treat? Treat, most definitely.

This DLC unlocks the Horror costume for Dal-Su Son.

Source:

Steam Store Description