This show has everything I expect from a BL: chemistry between the main leads and a plot that is not too absurd. ;)
The plot is actually quite believable - a family feud is a thing that happens in real world. Thankfully, we are spared the annoying tropes and cliches that plague BLs - some of them are even called out directly as such. The supporting characters are often silly and/or irritating, but this is also believable - we meet people like that every day. The plot twists aren't super dramatic, but engaging enough.
There are many series, where the chemistry between the main leads is more steamy, I know, but in here, the focus is on emotions. Ohm and Nanon show more feelings in one kiss than most other ships manage to express during a whole episode full of fluff. Their acting is really good - I don't mean it like a "soap opera good acting" but generally good acting. They don't even need to say how they feel, their expressions convey the message. The relationship between the characters is generally very satisfactory to watch - there is no toxicity between them, there are lots of small and big gestures that can make the viewers squeal, and the communication between them is just as good, as you would expect from best frenemies and later boyfriends.
What I also really liked is the music. Bad Buddy theme song won at the 27th Asian Television Awards, and rightly so - it is so catchy! And the lyrics are well-written (of course judging by the translation). I really like Nanon's voice too.
I will definitely re-watch this series - it is a perfect mood-booster.