The amount of times I rewatched this drama. 

I literally love every single part of it.

Personally for me, i love characters where the male lead is type of bad, not bad as evil murderer but a baddie 

and the female lead should be good or even the other way around. 

So do you have recommodations for me? (either k or c dramas)

These are oldies .. BUT I found them way more engaging than many 'modern' dramas .. 

You could try:

- Secret (2013) with Ji Sung

- Lovers (2006) with Kim Jung Eun

- Tempted (2018) with Woo Do Hwan 

- Another Miss O (2016) not technically bad-ass .. but does something bad caused by extreme betrayal with Eric Mun

- Beyond the Clouds (2014) with Yoon Kye Sang

- Bloody Heart (2022) with Kang Ha Na .. very complicated ML and a complex drama with many greys