need recommendation for thrillers.

Can anyone recommend me dramas where the main plot revolves around a character working exceptionally hard to achieve something, even if it comes at the cost of others' well-being? I'm looking for stories where the character's intense pursuit of their goal is a central theme of the drama

Examples of character would be : 

Jang Do Han  

Yoo Shi Joon from sketch 

 I do not need those dramas where the character is working to achieve his purpose through legal means( strictly adhering to laws)

I do not restrict myself to any languages so help me out.

Chinese dramas:
Nobody Knows - this drama has 2 sides. One where you meet the people and get to know their relationship and one side revolving around revenge.
Burning ice 
Kidnapping Game
Gold Panning - this one is either a drama you will love or drop.  I highly recommend it, it is absolutely amazing but it is not for everyone.
Day and Night


Taiwan:
The Victim's game
Trinity of Shadows - this one starts out with people trying to follow the law. and its actually really absolutely amazing in that respect since it shows so super well how much is too much for you to go against everything you believe in. highly highly highly recommend it.


korean:
Watcher 
Devil Judge

 Saygo:

• Evilive
• The Killing Vote

Okay thank you, I will check this out .