My Father Is Strange. Three main couples, one of them is exactly how you describe. It's a faily drama but it's very interesting and the chemistry between the couples is sizzling.
The Beauty Inside has a lot of verbal sparring and sexual tension between the main couple and the second couple. The FL is an actress with a wild child kind of reputation and she kind of lives up to it. Power couple here.
Cunning Single Lady doesn't have the most original story but plenty of banter and sass. The FL is a former beauty queen who has fallen on hard times, the ML is her nerdy ex who's made it big.
Goblin, She's the cute sort of sassy.
It's okay, that's love, I first thought of this when reading you. Though in this, it's the man who's sassy.
Mafia Luerd Mungkorn: Suer, is a lakorn, she's one of the silliest FL I've seen, in the first episode. One of the rare lakorns I've seen with these tropes.
King2hearts, she's a quirky sassy and they're a power couple.
The King of Dramas, I'm just at episode 3 and there is no hint at a romance yet, but I already think it might qualify. They'd make a great power couple, anyway.
