Female lead Shen Qingyue, the second young miss of the Shen family, is intelligent, thorough, and meticulous in mind, well-versed in court affairs, helping the crown prince dispel the fog and jointly building a prosperous age. Male lead Li Ji, an upright and resolute crown prince, harbors the country in his heart, initially harboring guard, later knowing and staying with the female lead, jointly guarding ten thousand miles of mountains and rivers. The two daughters of the Shen family together welcome the imperial marriage decree. The cousin, knowing the future trend, actively chooses the sickly prince in the eyes of others, pushing the position of the crown prince's consort to Shen Qingyue. Shen Qingyue, having experienced past encounters, calmly accepts the engagement and marries into the East Palace. With her exceptional resourcefulness, she assists the crown prince in seeing through layers of traps and resolving crises inside and outside the court. The two go from mutual probing to mutual trust,