First time watching Kdramas and just finished Slump Doctor. Need recommendations for series that have the same vibe.

EDIT: Can a mod fix the name of the title please? I have it backwards.

Male, mid 30s. Never watched a Kdrama before. Currently on business travel, with some free time and just binge watched the entire series of Slump Doctor over the weekend - and loved it.

( The music was amazing too, I have Selgugi (sp?) theme song on loop. :D

My wife watches these Netflix shows all the time, but I usually leave the room - still traumatized on how I was "forced" to endure the entire Twilight Saga years ago while dating... but I digress..

So what another Kdrama with the same vibes that is:

• Romcom, lighthearted but is also not afraid to turn on the waterworks from time to time but can't be a full time mexican telenovela.
• I am sucker for the rivals - friends - lovers trope.
• Childhood friends also work..
  • I am a video game characters shipper *clough* Cloti *cough*
• Don't tell my wife... but it has to have a happy ending, diabetes inducing, if possible. No bad endings, or God forbid "bItTeRsWeEt eNdInGs" - the latter is the worst kind.
• Hot FL :)

I have been browsing, and the show Queen of Tears keeps popping up, but the trailer doesn't show much. Would that be a good choice to follow?

EDIT: Thanks for all the recommendations. Will definitely check a few of these out! Different streaming services shouldn't be a problem.