Nudaeng, also known as Dipping Sauce Dog due to the dark stain around his snout, is a Korean mascot/meme character who started his life as an emoji sticker on instant messaging apps. People love his blank, hapless smile and his round little body. He is a mascot for the people, representing everyone who carries on in life even when things seem hard. And to top it all off he is also adorable.
You can find his official profile on Good Collection although as of the last time I updated this page, there is currently no official merchandise for sale, but that may be changing soon: Recently, a Nudaeng display was spotted at a Chinese marketing expo, which featured sample plushies of Dipping Sauce Dog as a weightlifter and also getting ready for bed in his pyjamas:

In the meantime you can find unofficial merch available on online marketplaces, as well as make your own plushie or even Dipping Sauce Dog inspired snacks from tutorials on apps like XiaoHongShu and Pinterest.