What the world hates most is Qin Gui's role in Yue Fei's murder. Yue Fei is a national hero who resists Jin Dynasty, and has been making contributions to defending the country. However, Qin Gui and the then king framed Yue Fei, which eventually led to his death in Fengbo Pavilion. In fact, the culprit here should be the Song King at that time. He was afraid that Yue Fei's power was too great and killed his heart. It happened that Qin Gui disagreed with Yue Fei's political views, so he began to frame Yue Fei, which eventually led to being reviled by the world.
In addition, Qin Gui not only suppressed loyal ministers like Yue Fei, but also persecuted people with different political views and those who didn't listen to themselves in court, resulting in many unjust cases. It not only made the court of the Southern Song Dynasty filthy, but also made the literati in the world feel chilling, made talents unable to serve the country, and made the Southern Song Dynasty even weaker and more unpopular.
The other is Qin Gui's peace proposal, which also makes Qin Gui take the label of betraying the country and seeking glory. Peace-building is a good way to avoid war, recuperate and spare people the pain of war. However, making peace advocated by Qin Gui is a complete surrender, which is not only not good for the Southern Song Dynasty, but also needs to transport a lot of materials to the enemy every year, seriously damaging its national interests.