dramalistsite:
This drama definitely need 2nd season,
so anything more like this (bonus if its kdrama)?
Hmm, maybe Duel - he does some pretty terrible things to save his daughter and doesn't seem to regret them. The ending is...more tragic than happy, though, imo (but it may depend on how you feel about certain characters). Otherwise, the closest I can think of is the ML in Blind (he's a cop who tends to break the rules, but still doesn't really fit what you're looking for). I can't think of anything else, sorry.