| Dr. | Chang | Hornclaw's doctor. |
| Elder | Han | Hornclaw's partner. |
| Dr. | Kang | The internist who helped
Hornclaw. |
| Haeni | Kang | Dr. Kang's daughter. |
| Mr. | Sohn | The agency director. Hornclaw's boss. |
| Bullfight | | A hired killer. Hornclaw's colleague. |
| Cho | | Ryu's wife. |
| Choi | | The crematorium caretaker. |
| Deadweight | | Hornclaw's dog. |
| Eonni | | Hornclaw's niece. |
| Grandmother | | Dr. Kang's mother. |
| Han | | Elder Han's son. |
| Hegel | | A German Philosopher. |
| Hornclaw | | Protagonist. Aka: Nails. |
| Kant | | A German Philosopher. |
| Kim | | A nurse. |
| Lee | | The chairman of J. Pharmaceutical Company. |
| Operative | | Bullfight's associate. |
| Oppa | | Hornclaw's nephew. |
| Park | | A nurse. |
| Plato | | An Ancient Greek Philosopher. |
| Ryu | | Hornclaw's guardian. |
| Spinoza | | A leading 17th century Philosopher. |
| Worryfixer | | Hornclaw's colleague. |
