This is an A-to-Z dictionary of human nature, and a life-leveling guide to emotional intelligence improvement, self-awareness, and inner growth, allowing you to live a confident, clear, and transparent life. Yang Tianzhen, the principal of the plus-size women's clothing brand PLUSMALL, uses her rich experience in the workplace, life, and entrepreneurship, starting from several keywords of human nature, with case studies close to life and witty analysis, to help readers deeply explore human nature, understand themselves, observe the world, and comprehend the true meaning of emotional intelligence. She analyzes common problems of contemporary people such as anxiety, social phobia, confusion, and entanglement, and helps them find their anchor in a changing world.