In Chen Wen Jyun's 'Rainbow Series for Self-Development,' this insightful book, 'The Smile is the Most Beautiful Radiance,' explores the profound and transformative power of a genuine smile. It offers practical guidance and heartwarming anecdotes that illuminate how a simple act of smiling can significantly enhance one's well-being and positively influence those around them. The author emphasizes that true radiance originates from within, and a joyful disposition, adorned with a radiant smile, serves as the most beautiful expression of inner peace and happiness. This volume encourages readers to cultivate a positive outlook and embrace the power of their own light.