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I wish I did, but not
Even though, I still drew back then and I can tell you that this isn't pro drawing, you can tell by looking at every character who's not a grown up. Their lines and expressions are almost the same everytime, and this isn't about drawing style — You can confirm it even by looking at the poses and at the eye style.
I also used to draw like this, but for sure I wasn't paid.
If we compare the novel artist and the manhwa artist, the difference is obvious.
Personally speaking, I don't think it's good for non professional artists to draw novels like these; they'll just end up ruining it all. And they also earn big money for it, so...
If it weren't for the horrible art, this would have bene really cute.
Even I could draw better that the artist...