It's probably some popular icon in Korea idk
Majority of artist will use the same art program (csp) when making their manhwa. Csp has a large list of assests to use to help with comic making so its probably one of those. I think ive seen the assest on acon3d which is another assest type store to make drawing easier! So thats why you will see similar things (=・ω・=)
Probably it is knocking off ralph lauren products
Like one person said it is a popular icon in Korea or at least teddy bears in general are. They were everywhere when I would shop I guess it is/was a trend
I swear I’ve seen like 5 bl artists use that fuckass “teddy bear” print on the shirts they draw