Shadow, an autistic girl, is in her prime. The unexpected death of her sister Lin Ying two years ago triggered her world-weariness. Her parents' indifference to this made her resentful and she ran away from home. Jin Yi, a girl with vitality, and Bing Qu, a girl with no strength, broke into Shadow's lonely planet and opened the lock that imprisoned her soul. They hoped that Shadow would live brilliantly and suggested that she change her name to Canying. Not long after, Jin Yi and Bing Qu learned the truth about Lin Ying's death. The three of them broke off their friendship resolutely. Can Ying couldn't bear it and died alone in a foreign land... There are many stories in between. All the cruel things are the truth. It's always better not to know some things than to know them.