Yu Nian, a modern female researcher, accidentally transmigrates into a novel and becomes a cannon-fodder supporting female character who is jilted by the crown prince. To survive, she binds a life-sustaining system that requires her to build a bond with the villain, Chunyu Han, the Ninth Lord. She boldly kisses the all-powerful regent in public, kicking off a sweet yet torturous entanglement full of wits and tests. Through countless crises, they grow from suspicion to trust, stand side by side against the royal conspiracy, and forge a legendary love that transcends status and prejudice.