In an era of incessant warfare spanning many years, Su Fengzhi, the legitimate daughter of a prestigious military family in the Tiancheng Kingdom, possessed a prominent lineage. Who could have known that overnight, her father would be framed for treason and collaborating with the enemy, her older sister—who had married into the Ninth Prince's estate and was pregnant—would die bizarrely, and the entire Su family would be executed. Escaping by a stroke of luck, Su Fengzhi later reinvented herself to become the "blind" zither musician Su Jin. Introduced to the Ninth Prince's estate by Princess Zhaoyu, she approached her former brother-in-law, Jian Shiliu, wanting to uncover the truth behind her sister's death and her father's treason. Meanwhile, her gentle and refined "elder brother," Su Linfeng, also seemed to be hiding a huge secret.