OH Sung-yoon
Underdog (2018) is the second project that LEE and OH collaborated after their first project Leafie, a Hen into the Wild (2011) which marked a record high box office in Korean animation history.
LEE, known for Nudeulludeu 2 (1999), Goindol (2000) participated as animation director and OH as director who has produced A Little dinosour doolie - The Adventure of Ice Planet (1996) where he took part in from development stage.