This paper aims to read, from the perspective of a human nature principle in Chinese Confucian philosophy, "The Boarding House," the seventh story of Joyce`s Dubliners, which deals with the tragedy of a young man entrapped by a clever and determined mother and a perverse daughter, and then forced to face an unwanted marriage in the long run and ultimately to reconsider his naturalistic environment. In appearance, Mr Bob Doran, an industrious young man, is a victim of the three nets from which Stephen Dedalus eagerly desired to escape: nation, religion and family. That is to say, he is a helpless young man making his living as a British colonial. Also, the predicament into which he falls by his own mistake is reinforced by the implicit conspiracy between a Catholic priest and a cunning mother who wishes to help her daughter have a proper family, which she herself fails to preserve. In such an adverse environment, Bob Doran appears as a paralyzed victim, who is agonizing between fear of losing his good reputation and the prick of conscience, and finally cannot help capitulating to his own fate. Furthermore, his reappearance in Ulysses as a degraded drunkard convinces the reader of the fact that this moment is nothing but a starting point of his "fall." It is at this moment that the concept of "fall" from the viewpoint of eastern philosophy breaks into the predicament that Bob Doran is compelled to face. According to Mencius, one of the ancient Chinese philosophers, who persists in the good human nature principle, there are four elements that cause the deterioration of the good human nature: ensnarement of heart by material desire, subservience to environment, disappearance of night influence and consequent loss of heart. Mencius maintains that the four negative elements will prevent one from cultivating the good nature endowed by the Heaven, making a person helplessly deteriorated to the level of a beast. Such an interpretation may have a possibility to distort a creative work with "scrupulous meanness" into a mere moral allegory. However, it may also be able to offer an opportunity to reterritorialize a work of a genius writer into a new world of "hybridity."