Equilibrium

Okay so picture Shadow & Bone meets ACOTAR but the love interest is literally the villain she is supposed to destroy. Aenwyn gets sent on what is basically a suicide mission into Fae territory and instead of dying she finds out she is the key to an ancient prophecy. The slow burn between her and the Magus is absolutely devastating - they are on opposite sides of a centuries-old war and every moment they get closer feels like a betrayal of everything they know.