Liu Chenglong (1542- 1607) was a sexologist when the Korean Dynasty (Li Dynasty) was founded. Born in 1542 (twenty-one years of Ming Jiajing and thirty-seven years of Korean Li Zhongzong), he died in 1607 (thirty-five years of Ming Wanli and forty years of Korean Li Xuanzu).

Liu Chenglong is a civil servant and Confucian scholar of the South Korean Party in central Korea. Born in Yicheng, Anton, buried in Fengshan. Look at the word,No. Jian, Wen Zhong, posthumous title. Great-grandfather Liu Ziwen, grandfather Liu Gongchu, father Liu Zhongban, an observer of Huanghaidao, and mother Jin Guangcui, the daughter of Jinshi, studied under retired river Li Jue. Son Liu Kun and grandson Zhuozhai are both famous Confucian scholars in North Korea.

Liu Chenglong entered the imperial examination in 1564, and passed the third section of the imperial examination in 1566, starting his political career. He served as a critic in the Art Museum, deputy editor in the Hong Wen Museum, clerk in the Spring and Autumn Museum, and also served as a parliamentary official. Finally, he served as a leader (prime minister) and was in charge of the four major military affairs. 1569, as a holy festival, the official was sent to the Ming Dynasty.

Apart from his natural integrity, loyalty and filial piety, Liu Chenglong was in charge of state affairs and military affairs during the Japanese Rebellion in Renchen. He took a series of measures to resist the Japanese military capability, mobilized talents such as Li Shunchen and Li Quan, and followed the king to announce that his ancestors had repelled the Japanese army. 1598 was framed by Yin Doushou and others of the Western Party, and the defendant was impeached for plotting to attack the Ming Dynasty with Japan. 1600 reinstated after finding out the truth. But at this time, Liu Chenglong got tired of officialdom, resigned and returned to his hometown. 1604 was named Minister Hu Sheng, and was posthumously named Mr. Fengyuanfu.