I'm not the biggest fan of Manhwa, so when I find something a bit different, I enjoy it. The heroine, as noted above, is a pain in the ass, which I'm guessing we are supposed to just forgive as she's the baby in a house with three boys. I think this is also supposed to explain her rather rash, masculine behavior, which I don't buy because most of the heroines in manhwa are tom-boyish if not pretending to be men (if not girly men who turn into women). Any way, this is about dragons, and that was interesting. It also tied back into Mexican mythology, which was also interesting. It was too brief, it meandered off plot a lot, and the ending was all "WTF? That's it?"
On the plus side, it was different, being about dragons. Some of the random crap that occurred because our heroine doesn't know she's a dragon was interesting. Also, the amount of sexual innuendo was staggering for a romcom comic. Oh, and it was drawn closer to a manga-style, which might appeal to some.
In other words, it's not bad, but it's not one to go out of your way for. If you like fantasy and dragons, it was a bit of fun. But the romance was meh, although the comedy was pretty good.