This paper is to study Hakpo(學圃) who strove to realize ideal society with Jeongam(靜庵) on the basis of Dohak(道學) in the middle of the Choseon Dynasty. Hakpo thought human is superb being of all in life that can realize moral ideal in real society with the awareness of the inherent morality. He considered human as an autonomous being that can accomplish self-realization and communal goodness with purity and wisdom. He insisted human being never loses its goodness even if its intrinsic nature deviates from the mean(中). That's because human can recur to the original state through the moral discipline. Judging from this, it is concluded human can develop the individual potentiality depending on its exertion. Hakpo suggested several preliminary practical ways to actualize the ideal society based on Dohak. First, a sovereign should rule his subjects not by Machiavellian tactics but by moral norms and also control himself not with physical force but with objective moral law. In addition, he incessantly has to study Confucianism to convert the rule of force to the rule of moral. Second, a sovereign should not decide arbitrarily for himself but become a modest ruler who selects virtuous talents and takes great care of his subjects. At the same time, he ought to make the society open by guaranteeing the freedom of opinion that anyone can criticise ruler's and officials' malpractice.