Basically bros who are protective of one another or one is, at least, of the other. I'd much prefer it to be a serious plot or a comedy is fine too. It'd be great if it has the 'horror'/ 'horror-comedy' tag or genre. Any way, I've seen all those from the bromance lists online...so...if anyone knows something which is not out there on those lists..., plz suggest.☺

You might like the K-Drama Duel. ^^ There's a bromance relationship and the story is pretty dark though no horror. 

Do you like politics?

If yes, try Nirvana in Fire and All Quiet in Beijing

Nirvana in Fire 1&2

Tunnel

Goblin

Three more that are worth to check out: 

Omigosh, so many recs! THANKS a bunch guys!!!!!!????☺????