When Did I Become An Artifact Dealer?!

One scam package, That's all it took to drag the 17-year-old Cail into the world of the void. ... I thought I had ordered a limited-edition sneakers. But what came was a shady-looking package on my front gate. It smelled like rotten egg and sulfur. Inside the package was a strange box. It's filled with eccentric junk. They looked very intricate and mysterious. I thought I probably got someone else's package, a package from someone that was very interested in mysticism. An old coin, a cracked compass, a ring with an ugly center stone, and some other weird looking trinkets. So I did what any broke student would do: I sold it. I figured someone might want them for cosplay or something. Well, except the gold-rimmed glasses that seemed to fit me very well. Damn, I paid 7,000 nu for that sneaker; I better get something out from this scam package. Then all hell broke loose. Strange people started approaching me. People brought that junk. Very strange people wearing suspicious get up trying to buy those stuff in the sketchiest manner possible. As I kept selling, I realized that the box was refilling, it seemed to have an endless supply of those strange stuff. Those people called it 'artifacts'. Then one day I woke up with a strange tattoo on my arm; inside the tattoo was an independent space containing the box. It is basically inseparable from me. I didn't ask for any of this to happen. But now, strange people come to me with desperate offers. Money, memories, and even soul.  I'm just trying to survive high school while earning some money! I had no idea what was going on, but apparently, this thing I got? It's not just an artifact. It's a contract. As Cail navagates school life, part-time jobs, and otherworldly clients, he starts asking the real question: When did I become an artifact dealer?! By day, he is just an ordinary student, a NPC character. And by night? He is The Dealer. Selling ancient items and dealing with people that he probably shouldn't be talking to. Since I'm already in this mess, might as well profit off of it.