The State of Yu was defeated, and the Crown Prince of Yu went missing. The State Preceptor of Yu offered a beauty trap, forcing his own fiancée, Song Yuan, to enter the enemy state to seduce the enemy sovereign while waiting to find the Crown Prince to resume the battle and seek revenge. Song Yuan, a noble lady of Yu, could have lived a carefree life preparing for marriage, but she suffered continuous betrayal and hurt from her family and lover. They demanded that she single-handedly shoulder the heavy burden of national righteousness, and even forcibly poured a child-blocking medicinal decoction down her throat, destroying all hopes in her lifetime. However, the abyss of the enemy state that she imagined turned out to be the beginning of her true redemption.