"Payback" it's a drama about a corrupted reality, where money and power surpass truth and justice, the main characters join in a quest for revenge and to exposed the crimes to the world.

Eun Yong and Joon Gyeong are two people who met unexpectedly when they were young and formed a bond, they reunite when Joon Gyeong's mother is wrongfully framed and killed, they make up a plan to avenge her and make the people who did that to her pay.

Eun Yong's character is funny, clever and really interesting. I loved how he played with the stock market, using that to his favor, making people like chess pieces, since they move around money. The drama is also a critic of that, how money can corrupt people and that you shouldn't live your life seeking only money, you can lose sight of what's really important.
The only thing wrong about the drama is Tae Chun, he's really a boring character. I get his purpose in the story, but they should have put a better actor to do this part.

It's not a drama I would usually watch, but since it's the last drama of Lee Sun Kyun, I had a duty to see, since he was a actor I truly respected and loved and the drama really surprised me, it's really good, much better than what I expected.