After marrying into the palace, she became the regent's sweetheart from the position of a general's concubine. Su Yao, a woman who has been bullied many times because of her humble status, moves step by step in the whirlpool of power and intrigue, longing for equality and true love. The cold and domineering regent Xiao Yu was wary of her at first, but gradually fell in love with her during the Communist conspiracy. In the Dayin Dynasty, where class conflicts existed between the north and the south, and undercurrents of gentry and military generals surged, and the fate of substitution under the belief in destiny made this relationship perilous. With her sister's betrayal, the palace's schemes, and the attacks from both inside and outside, how can she stand firm? When the cold-faced prince lowered his guard and was willing to devote all his tenderness to her, the gears of fate turned quietly. Sweet love and power are intertwined. Watch how the flexible girl counterattacks in life and gains a lifetime of love.