Kang Zong, born in Beiping, Dingzhou, is known as Yangcheng. Yangcheng is modest and respectful, simple and simple, and treats all ages equally. People from far and near admire his character, and people come to study in succession. The local people had a dispute and decided not to go to the government, but to Yangcheng. A man stole a tree in Yangcheng. Yangcheng saw him, worried that he would be ashamed, so he stepped back and hid. Yangcheng family once ran out of grain and sent servants to borrow rice. The servant traded rice for wine and drank it on the road. Yangcheng was surprised by the servant's delay, so he took his younger brother to meet him. Yangcheng carried him back before waking up on the road. When the servant woke up and deeply blamed himself and apologized, Yangcheng said, "What's so strange about drinking in cold weather?" Shandong Jiedu House heard that Yangcheng was a virtuous man, so it sent messengers to Yangcheng to give 500 fine silks and warned them not to take them back. Yangcheng resolutely refused, and the messenger left the silk and went back. Yangcheng put the silk aside and never opened it again. Just as fellow countryman Zheng Wei was going to bury his relatives, he didn't borrow money from others. Yangcheng knew this situation and gave him the silk. Dezong called him to North Korea, appointed him as the right advice doctor, and specially sent Yang Ning, a captain of Chang 'an, to his home to send him bundles of silk.

When Yangcheng was not an official, scholars admired his integrity. When he becomes an official and an admonisher, all scholars think that he will be loyal to his duties, and officials in the world are even more afraid of him. After he ascended the throne, other admonishers frequently remonstrated on complicated political affairs, which made the emperor very bored, and then everyone dared not remonstrate.

When Pei Yanling framed and exiled Lu Zhi and other officials, because the emperor was very angry with Lu Zhi and others, no official dared to speak to the emperor. Yangcheng heard this and said, "I am an admonisher. I can't let the emperor kill innocent ministers." So Wang Zhongshu went to court with him, sternly reprimanded Pei Yanling's crimes, and enthusiastically defended Lu Zhi and others for many days. The emperor was furious and called the prime minister to cure Yangcheng. Yangcheng was demoted to the state for this crime. Yangcheng was appointed as Guo Zi Company, and those imperial academy students with outstanding filial piety were simply selected for promotion, while those who indulged in alcoholism and disobedience were all removed from the list. Yangcheng personally teaches classics, and under his education, students in imperial academy can strictly abide by the statutes.

Xue Yue is defiant and upright. Convicted of remonstrance, he was relegated to Lianzhou. The criminal chased him and arrested him at his home in Yangcheng. Yangcheng let the criminals sit at the door and wait. He invited Xue Yue to have dinner, and then accompanied him out of town to say goodbye to him. The emperor was dissatisfied with Yangcheng's guilt of nepotism, so he was expelled from the capital and became the secretariat of Daozhou. In Daozhou, Yangcheng governed the people like a housekeeper. The punishment of the punishment, the reward of the reward. I don't mind the papers and books in the government office. I only get enough monthly salary and give the rest to the government.