the same exact jewerely box appear in both of these webtoon

I think this is because artists sometimes use stock photos when it comes to drawing detailed parts of the setting. There were a couple bl webtoons where the interior of the houses were almost identical as well. This isn't artists ripping each other off, it's usually them purchasing the rights to a stock photo and using it as a reference. Drawing intricate backgrounds takes way too much time for artists when they are on strict weekly deadlines, which is why they do this. Purchasing those doesn't mean no one else can purchase it, which is why sometimes the exact same design of something may appear in multiple webtoons.

its a CPS asset lol

*i mean CSP