ShortCircuit

Old cases that seemed solved turn out to be cold cases. Same eerie small-town atmosphere, where everybody knows everybody else's business but at the same time murders were committed and people were blamed when they were not guilty, based on how the town perceives them.

Also - personal hurt and obsession / drive to solve the murders for the leads. Nice plot pacing (though slow).

Police stories featuring life at its most frustrating part. Both present very long cold cases, with slowly addictive characters, driven by obsession an stubborness. The mysteries aren't revealed all at once, it takes a very long time in both dramas to find out whodunnit. Kind of a similar atmosphere of weighty expectation for the leads to finally solve it and be done with it in order to live the rest of their lives freely.

... And lots of missed chances (that's the frustrating part).

10 Things is a lot more romantic-driven than Chosen Home, but still, it's about an older gay man who is too lonely for his own good until he finds love.

I've no idea if Chosen Home will go there (and if it does, it definitely won't get there by a too-romantic way), but it's interesting to see older people's romances, as slow and mellow as they might be.

Forced cohabitation leading to close relationships in both dramas. Also, again, found family trope.

A bit of a loneliness trope healed by doing stuff for your fellow man (or woman) in both of them, too.

Both are slice-of-life stories, dealing with everyday situations that also involve a bit of a strange turn once in a while.

Umi no Hajimari and Chosen Home also deal with found family - one blood-related, the other formed out of strangers, but still basically found-family.

Both seem to be very warm (Chosen Home has just started, but it does give off that feeling) and healing.

Both dramas are inspired by European original stories (one an original drama, the other a novel). They also share a support actress and the director. Sadly, it looks like the technical team isn't the same in Mantis as in Black Out, because it definitely shows. So far (ep 1), Black Out is the better drama. But if you want an European-feeling in your police kdrama, this could also be it.

Both dramas involve detectives taking a practical approach to solving crimes (as in, staging a crime scene, taking in all clues, etc).

Both also seem to be more male-centric with less romance, which IMHO is good for detective stories. Both also involve (some) humour.

Both dramas involve a lot of action and some vigilante justice. There are knives and good action scenes involving them, and also a lot of mobsters doing their thing.

Pretty interesting MCs in both stories.

Both dramas involve lots of gunfights (and some knife fights so far). Both MLs are retired soldiers (or mercenaries) and they didn't forget their training. Both dramas involve sidekicks who aren't what they seem to be.

Pretty good action, overall. Some interesting character portrayal, too. Recc'ed!

This is more of a warning than a rec, TBH - for those who are NOT into misery porn. These dramas appear to be filled with it (I'm certain on Namib's part, I've already watched it, getting a very similar vibe from The Defects, based on the first two eps).

The plots don't have much in common, except for the anguish element - each of the victims/vigilantes in The Defects seem to be in constant pain (and mental distress) from their experiences, much as the MC of Namib. In both cases, the people responsible for it are people who are supposed to be the characters' best help, parents or legal guardians.

So just an advice - if you're really NOT into watching people suffer through no fault of their own as a main plot device, consider giving these two dramas a pass.

Same director. Same sense of humour. Some of the same cast (not the leads though). At least part of the decor and styling is the same (the historical setting).

Both dramas involve soul/body swapping and adjusting to new circumstances for one of the lead characters.

Both dramas involve a dragon who couldn't ascend so they became Imoogi. Other supernatural creatures of the Korean folklore also appear and have a part to play in the story.

Both dramas also involve a love story that dates way back (ML is an immortal/very much older than the FL in both cases).