When Mu Liuyan, the legitimate daughter of the scholar Mu Xiuyuan, was five years old, her father was framed by his colleagues for surrendering to the enemy and treason, and his entire family was executed. She and her twin brother Mu Liuchen were fortunate enough to escape from the capital with the help of eight-year-old Baili Xi, the eldest son of the Grand Master to whom she was engaged. On the way to escape, Mu Liuchen was separated by the robbers and lost contact. The wet nurse spent all her money and asked someone to imprint a butterfly birthmark on Mu Liuyan's face. Mu Liuyan was taken to the home of her mother's cousin Sang Shizhong in Yecheng by her wet nurse. She was taken in as an illegitimate daughter and renamed Sang Yu. Sang Yu was bullied by the Sang family and his legitimate daughter Sang Xiyao. Sang Shizhong had no choice but to send the eight-year-old Sang Yu to the villa where his old friend Murong Li lived to practice martial arts and strengthen his body. Seven years later, as soon as he came down from the mountain, he was plotted by the Sang family to marry him, and was poisoned and made into a human pig by the cruel prince Qi Beitian. He was put into a coffin and suffocated to death. After her rebirth, all those who bullied her got their due retribution. The rouge mark on her face faded away, revealing her peerless appearance that attracted admiration. He went to Beijing to avenge his family and set off a storm of revenge in Kyoto. He went through many hardships and dangers, uncovered the fog, found out the truth, and killed the Grand Master's father who was the one he loved. For the sake of the people in the north, she shed her red makeup, put on her armor and went into battle to capture alive the real culprit behind the murder of her entire family, the Nanchu Monarch. She met her brother Mu Liuchen who was adopted by the Nanchu Monarch and avenged her parents. The Mu family was finally rehabilitated and Zhaoxue put aside her past feud with General Baili Xi. They had a deep love as husband and wife and went to the battlefield to protect their home and country together.
