People mourn for martyrs killed in the 1950-53 Korean War at the martyrs' park in Shenyang, capital of northeast China's Liaoning Province, April 5, 2019. It is a tradition for the Chinese people to pay respect to ancestors, deceased family members, and national heroes and martyrs at the Qingming Festival, a day for tomb sweeping which falls on April 5 this year. (Xinhua/Yao Jianfeng)