This is an agreement between the four of them, an agreement that no one knows about. The arrogant and stubborn Yi Le, the naughty and arrogant Xuan Huo, the calm and aloof Xuan Ye, and the gentle and calm Yi Xue. The four are all orphans, all 13 years old, all Avengers, and all have high IQs (180~190). For this agreement, the four of them have spent all their childhood and youth, their inner loneliness, and their inner fear. For this agreement, eternal life will never be destroyed. Dragons fight in the wild. If they don't win, they will be defeated. They live for fighting and will not rest until death.