Established in the late 1980s, Sung San (星山企画; Alternately known as Hoshiyama Planning) is a Korean-based animation subcontractor. More credits can be hound here and here
Credits include:
- Angel Beats! (In-Between Animation; Paint)
- Beast Wars II (Key & In-Between Animation; Paint)
- Black Cat (Key & In-Between Animation; Paint)
- Blue Gender (Key & In-Between Animation; Paint)
- Bubblegum Crisis (In-Between Animation; Paint for both the OVA and Tokyo 2040)
- Case Closed (Key & In-Between Animation; Paint)
- Chrono Crusade (In-Between Animation; Paint)
- Cowboy Bebop (Paint)
- Dance in the Vampire Bund (Key & 2nd Key Animation; Paint)
- Diamond no Ace (Key, 2nd Key & In-Between Animation; Paint)
- éX-Driver (In-Between Animation; Paint)
- Fairy Tail (Key, 2nd Key & In-Between Animation and Paint for both seasons)
- Freezing (Key, 2nd Key & In-Between Animation; Paint)
- Full Moon (Key & In-Between Animation)
- Future Card Buddyfight (Key Animation)
- Fuuun Ishin Dai Shogun (Key Animation)
- GaoGaiGar (In-Between Animation; Paint)
- Gasaraki (Paint)
- Gate Keepers (In-Between Animation)
- GEAR Fighter Dendoh (Backgrounds; Key & In-Between Animation; Paint)
- Girls Bravo (Key & In-Between Animation; Paint)
- Gonna Be the Twin-Tail!! (Key Animation)
- Granblue Fantasy: The Animation (In-Between Animation; Paint)
- Guilty Crown (Key Animation)
- Hayate the Combat Butler (Key & In-Between Animation and Paint for the first two seasons)
- Heat Guy J (Backgrounds; 2nd Key & In-Between Animation; Paint)
- Inari, Konkon, Koi Iroha (Key, 2nd Key & In-Between Animation)
- Inuyasha (In-Between Animation)
- Jojos Bizarre Adventure (Key Animation, 2012 series)
- Koi Kaze (Key & In-Between Animation; Paint)
- Lord Marksman and Vanadis (Key Animation)
- Mars Daybreak (Key & In-Between Animation)
- Monochrome Factor (Key & In-Between Animation; Paint)
- Monster (Key & In-Between Animation; Paint)
- MonSuno (Key Animation)
- Negima! Magister Negi Magi (In-Between Animation)
- Ōban Star-Racers (In-Between Animation; Paint)
- Overman King Gainer (Key Animation)
- The Pet Girl of Sakurasou (Key Animation)
- Photon: The Idiot Adventures (In-Between Animation)
- Project Blue Earth SOS (In-Between Animation; Paint)
- Robotics;Notes (Key & 2nd Key Animation)
- RWBY: Ice Queendom (Key Animation for Episode 6 through Yong Sun Kim)
- Scooby-Doo! and the Witch's Ghost (In-Between Animation; Paint)
- Symphogear GX (Key Animation)
- Serial Experiments Lain (In-Between Animation; Paint)
- Seven of Seven (In-Between Animation; Paint)
- Skull Man (In-Between Animation; Paint)
- SoltyRei (Backgrounds)
- Speed Grapher (2nd Key & In-Between Animation)
- Steamboy (Paint)
- Super Robot Wars: Original Generation: The Inspector (Key & In-Between Animation; Paint)
- Sword of the Stranger (Paint)
- Tenchi Muyo! (Paint for Daughter of Darkness, In-Between Animation and Paint for the third OVA series)
- Tenchi Muyo! GXP (Key & In-Between Animation; Paint)
- Tenkai Knights (Key & 2nd Key Animation)
- Tokyo Majin (Key & In-Between Animation; Paint)
- Transformers: Cybertron (Key & In-Between Animation; Paint)
- Trinity Blood (Key & In-Between Animation; Paint)
- Wangan Midnight (Key & In-Between Animation; Paint)
- We Were There (Key & In-Between Animation; Paint)
- Witch Hunter Robin (In-Between Animation; Paint)
- You're Under Arrest! (Paint for the series; In-Between Animation for the movie)
- Yowamushi Pedal (2nd Key Animation)