Why was Lan Wangji, the founder of the demonic path, angry that Wei Wuxian took off his forehead wiper?

In the grand talk and archery competition held in Qishan, Wei Wuxian teased Lan Wangji for wiping his forehead. Although he was angry, he did not get angry. However, when Wei Wuxian took off his Why are they angry when they are wiping their foreheads? Let’s first restore the story scene.

Wei Wuxian is a naughty person, especially for someone as rigid as Lan Wangji. He prefers to tease him. At the archery competition, Wei Wuxian greeted Lan Wangji from a distance but ignored him. Wei Wuxian was naturally unhappy, so he joked that his forehead was crooked, but Lan Wangji actually helped him, making Wei Wuxian laugh. This was just the beginning.

During the archery competition, Lan Wangji, who is always in trouble, kills two birds with one stone. Not only did he save people, but he also hit the target. Maybe it was because his movements were too big. This time he had to wipe his forehead. It was really crooked. Wei Wuxian kindly went up to straighten it, but accidentally took it off. Lan Wangji was so angry that he crushed the bow and arrow. Wei Wuxian was also frightened at that time, even though Lan Wangji usually He was very serious, but he had never been so angry before. It turned out to be because of the Lan family's rules.

The ancestors of the Gusu Lan family once established family rules. Only in front of the destined person and the person who loves you, there is no need to have any rules. In other words, no one can take off this forehead wipe except himself and his significant other, and Wei Wuxian is definitely not his destined person or the person he loves, so taking off his forehead wipe is breaking the rules. Think about it, back then Wei Wuxian was so angry when he glanced at Xiao Huangshu. Now in public, his forehead was removed, how could he not be angry? Although it violated the family's taboo, it was not allowed to be done in public. The best thing to do is to use items to vent. Moreover, he is still the one who punishes the Lan family's family rules. No wonder he is so angry after breaking such a taboo.