Ye He Na La Si Ti (葉赫那啦‧思偍), shortened Ye Si Ti (葉思偍), also known as Sun Jian (孫堅), is the antagonist of the third season of K.O.3an Guo. He is the biological father of Sun Ce and Sun Shang Xiang, and adopted father of Sun Quan, and the headmaster of Jiang Dong High School, now known as Dong Wu Academy. He is also the younger twin brother of Ye Si Ren. For the sake of world order and self protection, he highly prohibits his children from finding true love in the Silver Dimension. He is also the one who agreed to Ah Xiang and Yuan Shao's engagement when they were kids.