Eastern Han Dynasty, in Nanyang so two people, a man named Chu Hui, a Kan Zhang. Zhang Kan Chu Hui heard in a long time ago is in good faith, so much admiration for him. On one occasion, two men in the Imperial College in occasionally to get to know, really is the so-called Brief Encounter, to break up, Zhang Kan Chu Hui entrusted after the death of more concern in their own wives and children. Several years later, Zhang Kan alas a disease, leaving a hard to make ends meet youngest.
Chu Hui Zhang heard that the wife and children living in poverty deserve, we went to visit in person to give a lot of material help, caring for them. Chu Hui Zhang worthy of trust, and there is no promise, and Chu Hui on its own, it is a friend of good faith between the top of the pops. For many years, "the situation with Mr. Zhu," the term has been regarded as the feelings of sincere friends, pay attention to the credit of the pronoun.
东汉时，在南阳有这么两个人，一个叫朱晖，一个叫张堪。张堪在很早以前就听说朱晖十分讲诚信，所以对他十分仰慕。有一次，两人偶然在太学里结识，真所谓是相见恨晚，到分手时，张堪托付朱晖在自己死后多多关照自己的妻子儿女。过了几年，张堪一病呜呼，丢下一家老小艰辛度日。
朱晖听说张堪的妻儿生活贫困，便亲自前去探望，给予很多物质上的帮助，对他们关怀备至。张堪对朱晖的嘱托，并没有任何许诺，而朱晖就自觉履行了，这可是朋友之间诚信的最高境界。多少年来，“情同朱张”这个词汇，就一直被人们视为朋友间感情真挚，讲究信用的代名词。