2. Going to the meeting with a single knife comes from "The Biography of the Three Kingdoms Wu Shu Lu Su": "Su invited Yu to meet each other, and each stationed in a hundred paces, but invited the general to go to the meeting with a single knife." Interpretation: single knife: a knife refers to a person. It turned out that Guan Yu only brought a knife and a few followers to Jingzhou for a banquet. Later, it generally refers to a person taking risks to keep an appointment. There is a feeling of praising the wisdom and courage of the participants.

After being perfunctory by dramatists and novelists, Guan Yu became a hero, while Lu Su became a short-sighted and timid dwarf. This is an artist's creation, not a historical truth. Lu Su single-handedly promoted the alliance between Sun and Liu, and it was "difficult to keep for life" (Wang Fu's words). So Liu Bei and Sun Quan became stronger and established Shu and Wu to compete with Cao Wei. The Three Kingdoms period only appeared in the history of China.