In the depths of the jungle of the Preah Khan Temple, there is a beautiful temple, the St. Tong Temple, which the locals call the Simen Temple. It is the most memorable building of the entire Preah Khan Temple, because the center tower is decorated with four mysterious Bayan style faces. These faces show the most mysterious smile among the entire Angkor ruins. The whole Buddha image has been surrounded by layers of branches and leaves, which is extraordinarily mysterious. Although I have passed the most difficult road, I have also seen the most mysterious smile in Cambodia.