Koo Ja Wan
- Name: Koo Ja Wan
- Native name: 구자완
- Also Known as: Gu Ja Wan
- Nationality: South Korean
- Gender: Male
- Born: September 25, 1982
- Age: 43
Composer
| Title | Rating |
|---|---|
| Officer Black Belt | 8.6 |
| Our Season | 7.9 |
| Evilive | 8.1 |
| The Killing Vote | 8.0 |
| Bloodhounds | 8.7 |
| Dr. Romantic Season 3 | 8.9 |
| My Heart Puppy | 8.0 |
| Reborn Rich | 8.5 |
| Next Door | 7.0 |
| Hail to Hell | 7.3 |
| Carter | 6.4 |
| Body Parts | 6.9 |
| Seoul Ghost Stories | 7.2 |
| The Legendary Tazza's Tap | 8.0 |
| So Long, See You Tomorrow | 7.8 |
| Short Bus: Mysterious Reality | 0.0 |
| Goedam | 6.5 |
| Hyena | 8.2 |
| Dr. Romantic Season 2 | 8.7 |
| Dogs in The House | 0.0 |
| The 12th Suspect | 6.8 |
| The Divine Fury | 8.0 |
| A Daytime Picnic | 7.0 |
| Romang | 7.6 |
| Trap | 7.8 |
| Gangnam Scandal | 7.2 |
| I Have a Date with Spring | 6.6 |
| Cinema With You | 6.8 |
| Duck Town | 6.7 |
| Mafia Game | 0.0 |
| Seven Years of Night | 7.0 |
| Cheese in the Trap | 6.8 |
| The Villainess | 7.9 |
| The Emperor: Owner of the Mask | 7.9 |
| The Poet and The Boy | 7.0 |
| Dr. Romantic | 8.7 |
| Proof of Innocence | 7.5 |
| Horror Stories 3 | 6.7 |
| Ex-Girlfriend Club | 7.5 |
| The Deal | 7.1 |
| The Target | 7.6 |
| Montage | 7.8 |
| Incarnation of Money | 7.8 |
| Vampire Prosecutor Season 2 | 8.3 |
| Hero | 7.1 |
| Tree with Deep Roots | 8.3 |
| Yaksha | 7.0 |
| My Dear Desperado | 7.2 |
| Wedding Dress | 8.3 |
| Secret | 7.2 |
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