Out of the five brothers from the Lu Family, only Lu Siyan and Lu Youye knew about the relationship between Li Muchen and Lu Sheng.
Last time, when Lu Sheng saved Mayor Lin's son, Lin Yan, on the street, Fang Hong brought Xiao Yan to the school specifically to express their gratitude, and Lu Siyan came as well.
During the lunch they planned to have together, it just happened that Li Muchen came to pick up Lu Sheng, and Lu Youye secretly followed behind, and thus they all bumped into each other.
When introducing himself, Li Muchen didn't deliberately hide anything and frankly stated that he was an admirer of Lu Sheng.
At that time, Lu Siyan had just met Lu Sheng as well and wasn't very familiar with her, so he didn't have any particular aversion to Li Muchen.
But Lu Youye was immediately on edge, guarding against Li Muchen during the meal as if he were a thief.
The Lu Family and the Li Group had business dealings before, and Lu Jingyan had also interacted with Li Muchen.