Lin Jian, an outstanding employee of the underworld, has the latest task: to transform into a eunuch in the cold palace and ensure that the sick and frail prince is poisoned on time after three months. KPIs are clear and rewards are generous. Until he met the prince - his face was exactly the same as his modern lover Bai Yueguang who died young. Facing the ironclad book of life and death and the lost love, Lin Jian fell into the ultimate paradox: Should she carry out a mission and push her lover to her destined death with her own hands? Or do you want to change your destiny against the will of heaven, even if the cost is to become the enemy of the whole world, or even to lose your own soul?