These four young people with different characters and personalities cherish their friendship. They organize a theoretical troupe. They express themselves by using seemingly limitless youth and vigour. In an accident, some regret and hatred develop among them. This troupe ends up being dismissed. Three years later, the three young men get together. But Hanyin, the only female member of the troupe, is missing. Where is she? Besides making investigation on her whereabouts, the three men also try to resolve the unsolved problem that happened three years previously. They even dig out some secrets. The last delicate layer which could maintain some degree of friendship will soon be destroyed. What on earth is that period of happiness? Was it a dream or will it be totally forgotten?