Before long Xiaobai mounted the throne，and he later became a famous king，known as the Duke Huan of Qi。Duke Huan had prince Jiu murdered，and put his follower Guan Zhong under arrest at the same time。Bao Shuya being Guan Zhong's best friend，immediately went to Duke Huan and appealed for his friend's release。He highly praised Guan Zhong's wisdom and talent。He said he was quite at home in disciplining an army and running a country。He persuad-ed Duke Huan to set Guan Zhong free as soon as possible，in order that he could establish achievements in governing the country。
Duke Huan said that Guan Zhong was a sworn foe of his，if he set him free，how could he take revenge for the dreadful arrow shooting。Shuya said that a sagacious man had no personal enemies，and he should always be forgiving of his ministers。Guan Zhong had been loyal to Prince Jiu，and he may be willing to serve you。As you have already decided to govern Mid-China，you won't make it without him。
Duke Huan did accept Shuya's opinion，and he even sent Shuya to receive Guan。Duke Huan treated Guan Zhong with rites，and used him without a fig of suspicion。Later under the auspices of Guan Zhong，the country was thriving day by day。At last Duke Huan achieved his goal，and he called Guan as“Father Zhong”。
When he was older，Guan Zhong constantly mentioned the friendship with Bao。He would say，“I was born by my parents，as was blissful And I was known by Bao，that was even more blissful。Thanks to Bao's understanding of me And thanks also to Lord Huan's trust。”“Bosom friends，Guan and Bao”as an idiom，is the same as you would say David and Jonathon are best friends。