OMG you should watch Remember: War of the Son. Best drama I've watched besides The Princess' Man. For me that is. 
Thanks I already plan to check out Remember as soon as it's finished airing. Was just waiting until it's finished before I start. 

I'm probably one of the few people on here who doesn't like The Princess' Man. 
Following your criteria I suggest :
Healer
Love me if you dare
After the rain
My sunshine

I would still recommend
Kill me heal me ...I think they're in their 30s
It's ok that's love...idem
Loving, never forgetting...idem
Fated to love you (Korean version)...idem
Nirvana in fire (which is to me one of the best dramas of all times)...but it's 54 episodes


Thanks. I've already seen Love me if you dare, Kill me heal me, It's Okay, That's Love & Healer. Enjoyed most of those. 

I will look into the others though. Which After the rain did you mean? There's a few things that come up when I search for that title.