Cunning Single Lady is exactly what you want. I'm currently watching the turkish remake, I feel it's as good if not better. Cute jealousy.
Get Karl! this one is an oldie but goodie. The FL is like a typical 2nd FL.
Discovery of romance : there are two ML, one is her ex. It's a REAL love triangle. I really like how the past relationship is really explored, but if you don't love love triangles, beware.
Halik: exes become work rivals, then friends. Very, very slow paced but still interesting.
Loving never forgetting: with memory loss and hidden child tropes.
https://mydramalist.com/10133-ngao-hua-jai : not my fave
proong nee gor...: thai drama, so the ML is very agressive. tons of jealousy.
Here to heart
roy leh marnya: No real jealousy though. The ML is really sweet.
So Wayree: It's complicated. It's a non-consent one night stand. Then they meet years later. You might like it if you can get past the first episode (the ML did not know she was not consenting).
Summer's desire: with amnesia trope. There's a remake but the 2010 version is better. Loads of jealousy and tension. Love triangle.
Hope you find something you like!