The girl Chen Yun lives with her parents in an ordinary alley in a southern town. Every family here has a small yard, and almost every small yard has a cat. Chen Yun's cat's name is Huang. One day, Huang Ran ran away from home. When Chen Yun was looking for it, he met a boy named Ding. Because of work, his parents moved from Taiwan Province Province to the mainland and temporarily lived in the alley next door. This is where the story begins.

This is an emotional story about people and cats. In fact, cats, like people, were naive and unguarded when they were young. When they grow up, they learn to test, guard against, retreat to the world and choose a trustworthy one? Grow old together. This is also a story about the growth between people. People will be naive, will grow up, will be emotional, will be hurt, will be moved, will be calm, but we'd better not hate. Maybe nothing special happens in a person's life, but one day he will know that it is a blessing to live safely with his family and loved ones.