The purpose of this thesis is to examine two moral emotions(‘ressentiment' and 'cheerfulness’) in Nietzsche's On the Genealogy of Morality. In “the first essay”, Nietzsche analyzes 'ressentiment' as the moral emotion of the weak and explains how the weak have succeeded in the inversion of values. However, Nietzsche considers that 'ressentiment' have played a negative role in harming human health from the perspective of the value of life. The feeling of the incompetence inherent in 'ressentiment', at first, turned the discontent (...) toward the powerful men. But in the end it resulted to oneself, and ascetic ethics appeared. The ascetic ethics have played a role in their own way. It not only interpreted the meaning of human suffering, but also kept it from disturbance of impulses and emotions. But Nietzsche says that the ascetic ethics is far from "great health", because it excessively restrains the exertion of our nature and power. The feelings of 'ressentiment' still remain in the ascetic ethics and make a life heavy. A sinful Life itself can never be a cheerful life. It is Nietzsche's idea that you can not really feel the cheerful emotion without departing from the moral duties and self-condemnation. Nietzsche suggests that "emotions of power" should be exercised to the maximum, unlike the ascetic who want to suppress emotions as much as possible. He believes that man must be completely free from moral obligations and guilt in order to experience these emotions. For Nietzsche, 'cheerfulness' is an emotion that comes to free humans completely free from moral duty. Man must unleash the yoke of life that forces only truth and good. Nietzsche says that "great health" comes when man seeks strength and beauty. 'Cheerfulness' is the signal that "great health" is coming. The restoration of 'cheerfulness' from the feelings of 'ressentiment' is a new challenge of Nietzsche's philosophy. (shrink)