In the early years of the Great Emperor's reign, Ban Ruolan, the daughter of Master Shenzhou's concubine, was selected by the court to become a female official in the palace. After she grew up, she fell in love with He Changqing, the son of Master He, a powerful figure in the capital. When she was 23 years old and could leave the palace, she fully expected to marry the man of her choice. However, she did not want her maid Zisu to accidentally make the emperor see Ruolan and favor Ruolan. Because the biological father of the maid Zi Su was the chief physician of the former imperial hospital, and he died unjustly due to the illness of the Queen Mother Xiaoxian. Therefore, the emperor accepted Zi Su as his adopted sister and named her Princess Jinyang on the grounds of Zi Su's introduction to Ruo Lan. Ruo Lan had no intention of accompanying him, but was unable to escape from the palace. He was indifferent to the emperor and angered the emperor, so he kept him in the palace, as if he were in a cold palace. Later, because the prince married another woman, Ruo Lan gave up all hope and fell ill with fever in the summer. When he was dying, the emperor could not let go of Ruo Lan, so he ordered the imperial physician to cure Ruo Lan and stay by his side as a personal maid. He also promised that Ruo Lan could leave the palace at the age of twenty-five. Ruo Lan had been entangled with Chengyou, the son of the emperor's uncle King Ping Xi, in the palace. Because King Ping Xi had treason, Ruo Lan was framed by the Xian Fei, which made the emperor suspect that Ruo Lan was a spy arranged by King Ping Xi. However, he also fell in love with Ruo Lan. Ruo Lan was hunted down by the direct descendants of the Concubine Xian, and desperately returned to the palace. From then on, she began a arduous journey of scheming, having an emotional entanglement with the emperor, and helping her adopted son ascend to the throne.