I would also reccomend Shut Up Flower Boy Band, but it looks like you've already given it a try ;)
Tumbling (jdrama)
Sirius (k-special, not subbed yet)
Time Between Dog and Wolf (kdrama)
King of Baking: Kim Tak Goo (kdrama)
White Christmas (kdrama - if you liked School 2013, I think you'll be happy to hear that Kim Woo Bin and Kwak Jung Wook (he played as Jung Ho) are in this as well. Even though there's a lot of guys in it that's bound to lead your mind to think of bromance - you'll probably go through this and forget you were looking for bromance in the first place.)
and this has nothing to do with what you're looking for, but after going through your list, I think you might want to check out "My Boss, My Hero"