1, the idiom "a piano and a crane" comes from historical allusions. When an official named Zhao Bian was ordered to work in Shu, his luggage was only a piano and a crane. This allusion can be found in Shen Kuo's Meng Qian Bi Tan. Zhao Bian was born in Song Zhenzong. His parents died when he was a child, and he was raised by his brother. After Song Renzong ascended the throne, Zhao took the position of Jinshi in 1034, and was later appointed as an official of Wu 'an Army. Zhao Bian is very honest as an official, so he is also known as "tough advice".

2. The reason why Zhao Bian was promoted to suggestion was mainly due to the recommendation of Ceng Gongliang, a bachelor of Hanlin. Ceng Gongliang recommended Zhao Kuangyin not because he knew Zhao Kuangyin, but because he heard that Zhao Kuangyin was an honest official. After Zhao Bian came to power, he really lived up to Ceng Gongliang's recommendation. During his tenure, he always dared to impeach without fear of power. Because of this, his reputation in the imperial court and even the capital is increasing day by day, and he has even been given the reputation of "tough advice".