Four children with very different personalities, fate arranged for them to meet, know each other, stay together, and separate. In the growth of youth, they witnessed each other's loneliness and sadness, entanglement and helplessness, but unknowingly, they slowly drifted away from each other. Some people are destined to be a touch of sunset in your youthful memory, touching your heart, but in the end they are just forgotten in the world...