Na is best known for producing the popular variety-reality shows 1 Night 2 Days, Grandpas Over Flowers, Three Meals a Day and their spin-offs.
Na made his breakthrough in 2007 with 1 Night 2 Days, which introduced the road trip format to Korean reality programming, as a regular cast of comedians, singers and actors visit various towns across Korea and spend the eponymous one night and two days there, engaging in activities such as games, camping and sightseeing, quickly became the highest rated variety program on KBS and a national viewing pastime, reaching a peak viewership rating of 40%.The show not only boosted tourism for the locations it featured, its massive popularity also extended to its cast and even the crew. Because Na often appeared onscreen during interactions with the cast, he himself soon became a household name among Korean audiences, who affectionately called him "Na PD" ("PD" is a commonly used term in Korean television that denotes "producer-director" or "production director")