Lee Cha Don is a prosecutor. But the world of prosecutors isn't a respectful and lawful place as many make out of it. It is filled with corruption and shady businesses. However, Lee Cha Don doesn't only have to stand against other prosecutors but also be followed by his past which ties him to the Bok family, a loan shark family that took him in years ago.
Incarnation of Money is the type of show that caters to a specific group of viewers, which is a bit sad because it's well done.
The storyline is tightly plotted and fun to watch. There's no one side always winning, both good and evil constantly gain the upper hand, alliances switch and no one is stupid. Secrets are figured out, and masks are constantly donned. It especially is entertaining as our hero is far from perfect, often toeing -and sometimes crossing- into villain territory himself, making for an interesting character arc.
That being said, there are downsides. If you prefer more action and less talking, the show isn't really for you. A lot of it comes down to political/business/law machinations, which can be interesting, but only if those are your areas of interest. And there are quite a few characters, which allows for many intersecting threads that make the world so complete, but also make it a bit difficult to keep track of everyone at times.
That being said, Incarnation of Money is definitely worth a shot. And if you like it, you'll enjoy the thrilling ride.