Bang Seong-joon is a South Korean voice actor affiliated with the Munhwa Broadcasting Corporation (MBC) voice acting division, which he joined in 2002. His career has been primarily dedicated to dubbing foreign animated series for Korean television, bringing a wide range of characters to local audiences.

His voice work spans numerous popular animated shows. He has contributed to the Korean-language editions of several long-running and globally recognized series. These include providing voices for the MBC broadcasts of Doraemon and Jimmy Neutron, as well as the SBS airing of Futari wa Pretty Cure. His credits also extend to other notable animated programs such as Ojamajo Doremi, Hoshin Engi, and Rodosdo for MBC and Tooniverse. For Cartoon Network's Korean broadcast, he voiced the character Richard Watterson in The Amazing World of Gumball and also appeared in The Amazing Adrenalini Brothers.

One of his prominent roles in animated series is voicing Headon, the enigmatic First Floor Administrator, in the Korean broadcast of the anime adaptation of Tower of God. Headon is a pivotal character who serves as the initial gatekeeper for those entering the Tower. He is responsible for testing Irregulars like the protagonist Bam and plays a complex, manipulative role in the early narrative by also facilitating the entry of the character Rachel.