Hey, I've seen so much dramas, check out my list and lately everything I start I don't end up finishing unless they are currently airing... However, just recently I watched Secret (2013) and I really, really liked it so I'm looking for a drama thats similar... if it's frustrating throughout the whole series I actually want it to have a good ending like Secret.. thanks!!

Not completed yet but Behind Your Smile is pretty amazing and it's about revenge on a rich woman through her daughter. I'm obbsessed with the show and the chemistry is amazing since the two main actors are besties. 

Another one is My Sunshine where he gets with his ex to torture her and seek revenge for her leaving him but ends up falling in love again. However for that one, I suggest you read my review/reccomendation on how to watch this show.  
http://mydramalist.com/profile/Jane2016/review/270...

Oh and if you liked Secret, Mask is also a REALLY good one!
Hey Janey, I've seen all of those mentioned, and I really liked them :), however I haven't started Behind Your Smile.. I shall wait for more eps and start that one because I really like the main actor. Thank you :)
All the slap kiss lakorns have basically the same plot. BUT most of them take that revenge thing too far. So check out this article before venturing into it.
Slap and Kiss dramas? What are they exactly?  
A few popular ones are
http://mydramalist.com/9853-game-rai-game-rak
http://mydramalist.com/9866-sawan-biang-2008
@ Janey, Yes Ma'am. Behind Your Smile is fire. I just hope it stays that way and they don't extend it and make it convoluted as some Taiwanese dramas tend to do. 
Queen Of The Game
Cage of Love has this plot.  So does Sealed with a kiss but I think it takes it way too far based on reviews and articles...breaks her arm...ect...