The Twitter account listed in the source is from a fairly popular Korean streamer called GOAROSA
From what I've seen in this Twitter conversation, Jeon Jae-Soon is like a mascot character or an anime-girl version of himself that's used on his channel. People can also contribute art during livestreams with some of them then being shared on his Twitter.
My Korean knowledge is basically zero, let alone Korean streamer culture, so if someone is more versed in this particular area, by all means feel free to give more context or point out if I made a mistake.
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