A brief introduction about Zhang Jun can be found on Baidu Encyclopedia.
Brief introduction address of Zhang Jun:/view/57970.htm.
Liu Kun's profile is very few, I only know the following explanation:
Liu Kun (1098 ~ 1 162) was a general who resisted gold in the Southern Song Dynasty in China. The word uncle Xin. Qin Zhou was born in Ji Cheng (now Tianshui, Gansu). In the tenth year of Jianyan, Yan Jingzong-bi (namely Jin Wushu) led the army to attack, and Liu Kun led the army to defeat 8 Jin Jun in Shunchang.