Dramas with Great chemistry, No Breakups, and Long Relationships

To the Moon and Back maybe? The main romance is very slow burn but there are literal puppies and the FL and ML become good friends en route to getting the rest of it going. The FL's family are drag queens who adopt stray neighbours too - every time they help someone sort out a problem, that person starts hanging out with them, or moves in.

Overall, it's so full of love and acceptance and fun. 21 episodes and they're friends (and obviously going to be together) from nearly the beginning. Maybe they fell out briefly along the way? If they did, it wasn't enough to remember.

Plus puppies.

From your Plan to Watch:

Falling into You has no breakup, but you know how age difference romances go -- she has to resist for a significant chunk of time, which does cut into the relationship length. But the way they relate to each other is healthy and lovely to see, and they are supported by the people around them.

Bromance has no breakup, and there's a lot of the leads having awesome chemistry together, despite the fact that they're doing that while the reveal is being teased and before they're officially in a relationship, which happens late in the drama. There are three couples, but it's the leads' chemistry that is off the charts. So if you want to see a lot of them being cute and hot together, it's your drama, but if you want them to be officially in a relationship while they're being cute and hot, maybe not.

Do you count the couple suddenly being separated by life circumstances for a significant chunk of the timeline that passes fairly quickly in runtime? And is it all breakups you want to avoid, or only painful, acrimonious ones?