Cool, badass male lead kdramas?

I’m looking for romance action kdramas where the male lead is badass

For example:

- ML in healer was literally perfect

- ML in Mr.Plankton, not exactly like healer but he was badass and he and the ML in Healer both have the  underground errand boy character which i love

- Vincenzo

But also something like descendants of the sun for example

probably:

Bloodhounds (debt-collectors, both boxers)

High School Return of A Gangster (gangster transmigrated into high school boy)

Itaewon Class (food business revenge story)

Tale of Nine tailed 1938 (war period drama with shapeshifters as leads)

The Devil Judge (law drama)

The Equator Man (revenge drama)

Vampire Prosecutor (law drama but the prosecutor is a vampire)

You're All Surrounded (police drama)