Ling Qiyan, the eldest son of the emperor's concubine, is dissolute by nature, ignorant and incompetent, the number one rich man in the capital. Later, he fell in love with a poor scholar, who made him fall in love with him. Afterwards, the poor scholar came back in blood and took his place as the eldest son of the emperor. It turned out that he Ling Qiyan was just the civet cat in the prince exchange.