So my recommendations are all about revenge but the people who do want that revenge do not always stay "good". I do not know if these are something for you, but if they are, here you go;
For korean dramas I would recommend you;
Watcher - personally I think this is the only drama on par with Signal.
Money Flower - Arguable the best revenge drama you can find. It is on such a high level just wow.
For chinese dramas, I would recommend you;
Burning Ice - The best damn C-drama I have ever seen when it comes to crime/revenge stories. Heck, it is the best darn thing ever produced.