[4][5] Na worked on the Thai horror mockumentary The Medium (2021) as the writer and producer.

[6] Na Hong-jin graduated from Hanyang University ERICA Campus Department of Crafts studying industrial arts and, at first, started in the advertisement industry, until he decided to pursue his dream as a film maker.

Na's debut feature film was titled The Chaser (2008), which was met with critical acclaim as well as commercial success.

The follow-up to The Yellow Sea was Na's critically acclaimed third feature film, The Wailing.

The film encompasses a deep weave of many themes such as religion, perception, comedy, and horror.

Na acted as the producer and screenwriter for Pisanthanakun's The Medium, a supernatural horror mockumentary.

[10] When writing the story, Na explained in an interview that The Medium was initially a sequel to The Wailing with Hwang Jung-min's shaman character.