Yoon Kee used to feel that being poor was a shameful thing and a sin. His sense of low self-esteem always made him blame his father for not giving him a good life. When he succeeded in his medical studies, he wanted to become powerful and earn a lot of money. However, everything became a painful experience. Now that he has become a doctor and a father, his self-reflection has allowed him to turn his resentment into gratitude, repaying his father and everyone around him, and to live a life of gratitude and contribution.