Main Characters
- Heeseung (the curios one)
- Yuna (the owner of the place above the stairs)
Supporting roles
- Jay, Jake, Sunghoon, Sunoo, Jungwon, Ni-ki (Heeseung's friends)
- Hyunseung (Heeseung's brother)
- Jason (Yuna's sister)
- Rei (Yuna's bestfriend)
- Da-mi (head of the paper company for Spade's Association)
- Kai (assistant head of the paper company for Spade's Association)
- Ethan (Heeseung's other self)
Camoes
- Eomma (Heeseung's mom)
- Dino (Heeseung's neighbour)
- Soobin (head boy)
- Namjoon (math teacher)
- Jin (Jay's private chef)
- Joshua (Jay's brother)
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The Unknown: SECRETS [EN-]
Fanfic7 school boys of Raven High School seeks to find secrets of the stairs behind their school that repeatedly made them curios of what's at the last step - they tried climbing up the stairs but something and someone kept avoiding them to climb it. Hees...