Two Male Protagonists of Metaphysics, Concealing Their Identities and Joining the Special Bureau

I want to read a book like "A college student before others, a fierce ghost killer behind others". There is a shortage of books. Please recommend. Both of them are very powerful. They both hide their identities in order to protect each other and want to learn about the supernatural. In the end, they joined a mysterious organization. Of course, there are other good-looking ones that I can recommend.