Responses
because most of the promo one shot is usually drawn by illustrator that doesn't usually draw serialized chapters and they have longer duration for making promos while on the other hand serialized chapters usually have very tight schedule plan and it go through many stages so it is in general hard for artist to be in top standard everytime while rushing for deadline (that's why you see more simplistic artstyle for faster drawing)
This one and HMMAP have the same author! NOT THE SAME ARTIST.
I wonder why can't the artist who made the promo continue to draw for this serie, this seems like the case for so many manhwa already.
This art is somehow a bit poorly traced from the one who draw "Who made me princess", and the pace is somehow flop in my opinion... #－.－)