Kdrama where villain is actually good guy

Hi, 

is there any Kdrama with Plot twist that reveals that bad guy was good from the beginning?

Thank you!

Main Character is an anti-hero

• Cruel City - ML is knows as drug mafia leader codename Doctor's Son / Paksa Adeul
• Bridal Mask - ML is considered a Japanese Dog during Japanese takeover in Korea (WW2)
• Bad Guys - Leads are part of high security in mates
• Mr. Hiragii's Homeroom (Japan) - Male lead is a teacher who kidnaps and illegally detains his students 
• Movie:
  • The Merciless
  • Confession of a Murderer

One of the considered antagonist did some bad things but toward the end, teams up with the good guys to bring down the Big Bad:

• Chief Kim
• Special Labor Inspector Kim
• Dcotor John - not really a villain, but more of the other guy strongly rejects and opposes the ML's ways and principles, thus they clash, but generally he is a good guy

Others:

• The Disguiser (China) - two of the leads, the older brothers plays as high profile military men that adheres to japanese rule on China during Japanese occupation and oppressions in WW2

mostly it's antihero ML, there may be are dramas where secondary characters or villains turnd to be good, but these characters aren't as deep, multilayered and memorable as anti hero MLs

so:

+1 to

Cruel City  (greatest drama and ML)

 Flower of Evil, 

Bad Guys  

also my recommendations:

The Smile Has Left Your Eyes 

Remember: War of the Son  (SML - you think he is really bad but then...)

Cheese in the trap - Villain as in fl believes he's actually a sociopath when she first meets him. 

City Hunter - Villain as in he's actually hunting a group of powerful men for sport.

Crash Landing on You - Villain as in he's a north korean soldier and fl is a south korean woman.

Cruel City - Villain as in he's an undercover cop posing as a mafia leader.

Flower of Evil - Villain as in he's believed to be a murderer.

Trapped - Villain as in he's a mafia leader.

Long Time No See - Villain as in he's a hitman.

Moon Lovers - Villain as in everyone believes he's insane and that he historically killed his brothers.

Mr Sunshine - Villain as in he worked for the japanese mafia during the japanese occupation of korea.

Terius Behind Me - Villain as in he's believed to have killed someone.

Innocent Man - Villain as in people believed he murdered someone.

King's Woman - Villain as in he is a king that invades other countries.