Like the FL possesses something that both the ML and SML wants and gives both of them equal opportunity to manipulate her to give it to them. Like they're both after her for their own selfish reasons. And perhaps they booth deceive and lie to each other which eventually hurts the FL and basically makes any happy ending a bittersweet one where neither walks away perfectly happy. 

BONUS POINTS: If the FL walks away with a third guy who perhaps had no or just minor role in the plot, lol.

These may not be EXACTLYYYY what you're looking for, but are similar. It's a harder search with both SML and ML.

Please Feel at Ease Mr. Ling- This was the drama that first came to mind. The ML first approaches the FL because she has shares at his father's company. But he falls in love with her. The only thing that's different here is the brother of the ML also tries to approach her because of the shares, but he's not the SML.  Either way, the FL feels betrayed. Yes it's a happy ending.

Roy Leh Senae Rai- I don't know if you're into Thai dramas or not. But this is another one that came to mind. No SML here who wants something of hers tho. It's just the ML who manipulates her to get what he wants, but later regrets it when he finds himself falling for her.

I know there's more but not at the top of my head, I'll let you know if I think of any