Why?

Obviously, the young brown-haired man didn't believe Rean. After all, he had the tablet that could find those Fallen Light Star Fragments. He found it way before even really seeing it. However, before he could say anything, the vendor in front of the stall called their attention, saying, "I'm the one selling it, and I saw you two reach for it at the same time. Let's do it this way. The one who offers more will keep it."

Sure enough, he wouldn't let such an opportunity pass up. He carried this thing, not thinking it would be of much value, but it seemed like he was lucky.