I recently watched an older CDrama that gripped me. Too Late to Say I Love You. Was startled by how damned good it was. There is a bit of a love triangle that dissipates fairly early on into a protagonist and antagonist role for the ML and second ML. As well an antagonist relationship between him ( the second ML) and the FL. I cant really describe it as a love triangle.
Anyway, I recommend trying it for a few eps and see if you dont find yourself hooked.