In a small town named Chimney Town, each resident has a chimney atop their head, from which yellow smoke emerges when they're happy and blue smoke when they're sad, painting the sky above the town in vibrant colors. One day, a bird egg accidentally falls into the chimney of a little girl named Congcong. To protect the egg, Congcong even held back her own smoke, but her face kept getting redder and bigger! Can Congcong keep her emotions in check to safeguard the egg? This narrative explores a child's innocent clumsiness and brave perseverance in protecting a bird egg, while metaphorically comparing chimneys to emotional outlets, conveying to children the importance of expressing and releasing their feelings.