Lee huang (李滉) and Qi da-cheng (奇大升) had argued the question in terms of two set of feelings: the purely good Four Beginnings (四端) and the sometimes good and sometimes evil Seven Feelings (七情) at early Choson (朝鮮) dynasty。 And then 「The four-seven debate」 established a distinctive problematique that strongly oriented Korean Neo-Confucian thought towards exacting investigation of critical issues regarding the juncture of metaphysics and their all-important application in describing the inner life of the human heart-and-mind。 Even though the debate sometimes had caused unessential doctrine, it is permanent question in search of human nature.