Best Badass (Action) Male Leads. HAPPY ENDINGS please

I'm looking for more shows like A shop for killers, K2, Rugal, Kill It (loved it until the end), currently trying Blood Free.

I love action series with tough badass bodyguards/assassins' type leads who are super protective over the ones they love (lovers/family/friends) and will kill anyone tries to hurt them.

What I loved, in case it helps with recs :)

I loved A shop for killers because Jin-man was a legend amongst people in his line or work, they knew he was smart and deadly and regarded him as such. Even when he training his niece (unbeknownst to her) he had all the right skills that made it so she could survive against people who killed for a living. I loved that he ensured her survival and I'm dying to see his part of the story.

Rugal is one of my all time favorite revenge dramas because he though he was a cop before everything when to shit, he is willing to break the law and hurt and kill to get to the men who killed his wife. though I felt like there were a couple loose ends and really want another season.

Kill It I liked because he was great at what he did but also could have been happy as a vet but he fought so hard to protect his small circle of friends even when he knew it would cost him.