The typical story of a poor main lead who defies all odds to battle a bad, rich antagonist.

There are a few key differences though:

1. The character of the male main lead - a very morally upright person that "does what he believes in". This may lead to socially indifferent situations, some logically questionable decisions, and also some superbly heroic ones, and while it isn't necessary different from a lot of main chacters in dramas today, the intricacies in his character development, and the way its acted out is superb to say the least.
2. The character of the female main lead - a exceptionally smart and good looking girl who may seem socially cold, her character is not something you would often see, especially in Korean dramas where they would simply be there just for emotional support.

The first half of the drama was exceptional, beautifully directed and shot. The pacing was on point, along with the character development of the team, but then, as with a lot of successful Korean dramas, it got popular, started getting littered with product placement, and the effort, character development, and everything that made it great got lost with it.

TLDR: The writing and key plot points were very clever and well thought out, and I'll be sure to give the webtoon and any of his future works a look. But the lack of execution from direction and production towards the second half of the drama was disappointing to say the least.