They first met when they were ignorant children. Together they climbed trees to dig out bird's nests and went down to the river to touch small fish and shrimps. Although Bai Kuang always stood aside and watched classmate Geng Zhanlu having fun alone. Many years later, classmate Geng realized that the original cause had already been planted when they met, and the entanglements they experienced later only pushed the original cause to the final result. We are brothers in this life, and we will share the unfinished cause in another life. "How well said this is," Geng Zhanlu said many years later when he stood side by side with him.