The Nian Beast and Noise 年獸與噪音

For every child who loves and cares for the environment.

In a distant mountain, a creature called the Nian Beast lived for many years. One day, it decided to visit the city. At first, the Nian Beast was amazed by the city's bustling scenes, but soon it felt scared and quickly rushed back to its cave, feeling relieved.

What could have frightened the Nian Beast so much?