The translation feels weird this time, mostly with the reactions to the book...
That aside, I don't even see the point in showing off his calligraphy when he's trying to sell a book. It's not like it should even affect the interest in the book itself
@Fwaifuxsenpai of course, but how exactly does "I'm good at writing" make the origins of the book less suspicious? It's not like he said "it's been passed down on my family for years" or anything.
Besides, the highschooler is in a meeting with high rank people of diverse fields, in one of the best restaurants. That implied backing alone is more reassuring than his own calligraphy if a scam worries you.
Maybe it's the fact that this webtoon says too little through text and just jumps from one action to the next for almost no evident reason.
Man this plot reminds me of Great Epectations; MC is super lucky, has a girl after him, nothing happens the whole time, probably going to F himself over in the last 5 mins.