Soul Fire summary:

The Office of Nuo is the government’s secret department that protects humans from the misfortunes and complications brought on by evil spirits. Yoon Taehee is a Naja who happens to be an agent in the Office of Nuo. Wanting to recruit a successor, he seeks out those with the ability to see and hear spirits. One day, while out on an undercover mission, Yoon Taehee ends up meeting a suspicious student at a high school in the outskirts of a small city in the countryside… “So, friend, how old are you?” TL/N: Korean equivalent of someone who practices Nuo Folk Religion. Under Korean traditions, the religion revolved around exorcism and banishment of evil spirits.