Species distribution can be understood through factors such as available resources.
Sign is 2011 South Korean television series , starring Park Shin-yang , Kim Ah-joong , Jun Kwang-ryul , Jung Gyu-woon and Uhm Ji-won .. Park Shin-yang. Park Shin-yang. Kim Ah-joong. Kim Ah-joong. Jun Kwang-ryul. Jun Kwang-ryul. Jung Gyu-woon. Jung Gyu-woon. Uhm Ji-won. Uhm Ji-won. It is about the life of forensic doctors .. It aired on SBS from January 6 to March 10 , 2011 on Wednesdays and Thursdays at 21 :55 for 20 episodes .. SBS. Seoul Broadcasting System