This is a story about a group of people, a story about a group of people growing up after experiencing love. Each of their stories is so vigorous and will last until death. Why did the best friends turn into enemies in the end and become strangers? In their most youthful years, love can only be regarded as a guest. After it passes, they will not miss it. If they fall in love, they will endure the pain. Who is running for whom?