Cheng Yao, the eldest daughter of the Cheng family, was forced to marry for her younger sister and became the concubine of King Yu Jin. In the palace, she relied on her medical skills and wisdom to resolve crisis after crisis, and gradually developed a relationship with Yu Jin. However, Yu Jin mistakenly thought she was a spy and launched a series of tests and tortures on her. After Cheng Yao learned the truth, she decided to leave the palace. Yu Jin realized his mistake and began a long road to chase his wife.
