 It's been reported in the Annals of the Joseon Dynasty during the Sejong Era, that he suggested this implementation of male doctors because of discrimination between the genders; he stated that even if a male is a slave of another slave, he would still be treated for no matter what.He expressed his concern at how there could even be a male doctor that would feel "ashamed" when looking at a female patient and ultimately refuse to treat her.Although the uinyeo system started to practice medicine, it was deeply related to a Korean traditional custom at the time.