It's been a while since i've read it but the main details I can recall of the novel is that it's set in a modern setting. The MC is a male perhaps still a student not really sure. His job is to act as an appraiser but he does so anonymously getting the payment through a bank account. I'm not sure if he has any special ability but I do remember magic being involved and him getting stronger. I think early on he used some contacts of his to try to buy artifacts for him but later on decides to go to auctions, including some underground, to buy them himself.