(Note: using some non-canon facts, and you are Wei Wuxian's sibling in this, as the tagline states. I suggest listening to either "Hey Brother," or "Partners in Crime" depending on the route you're gonna go for this story, otherwise, enjoy).

Cloud Recess, Gusu Clan, Gusu, Burial Mounds.

Association with the Yiling Patriarch was something people feared. When Jiang Cheng cut ties with him? It saved his reputation.

But when you're the sibling of the Yiling Patriarch, no matter if you cut ties with him or not.... your still connected to him, regardless. And that's when rumors start and spiral out of control. That's how it's always been since Wei Wuxian took the path of the Demonic Cultivation.

Welcome to the life of being the younger sibling of Wei Wuxian. Let's break it down, shall we?

After the Bloodbath of Nightless City, many had their opinions on him. It was just clear. And what happened, specifically?

Wandering from city to city in a daze, Wei Wuxian overhears a group of low-level cultivators discussing him. They claim that that Wen Ning had lost control during his surrender, killing cultivators from multiple clans, and that he and his sister have been burned alive. Wei Wuxian brutally beats the men before seeing the announcement spread across the city gate: a pledge conference to oppose the Yiling Patriarch, to be held in Nightless City. Hiding among the heavenly beast statues atop the Palace of Sun and Flames, Wei Wuxian witnesses Jin Guangshan pour out the supposed ashes of Wen Qing and Wen Ning, before pledging to lay siege to the remaining fifty or so members of the Qishan Wen Clan on the Burial Mounds. Wei Wuxian then makes his entrance, reminding Jin Guangshan of his word to forget the deaths of Jin Zixuan and Jin Zixun if Wen Qing and Wen Ning surrendered themselves. Jin Guangshan replies that Wen Ning's loss of control has nullified their agreement, and, during their argument, an archer shoots Wei Wuxian in his chest. Wei Wuxian retaliates by hurling the arrow back into the archer, killing him and devastating his young brother. A battle begins once Wei Wuxian used Chenqing to raise the many corpses around Nightless City. Lan Wangji attempts to reason with him, but Wei Wuxian is convinced that he wishes to kill him, even claiming that he has always known they were destined to fight each other. However, he regains some control over himself when he hears Jiang Yanli crying out his name. Wei Wuxian, Lan Wangji, and Jiang Cheng all rush for her, but in his current state of mind, Wei Wuxian cannot control the corpse that slashes her in the back. Fortunately, she is not mortally wounded, and Lan Wangji quickly dispatches the corpse. Jiang Yanli wordlessly expresses that she had come because she wished to see Wei Wuxian again, and aloud, requests that he stop the corpses. Wei Wuxian agrees, and the battle begins to abate. Suddenly, Jiang Yanli shoves him, and a sword pierces into her own throat instead. The brother of the archer has attempted to gain revenge on Wei Wuxian. Hysterical at his sister's death, Wei Wuxian breaks the boy's neck, only to be chastised for his cruelty. In despair, Wei Wuxian takes the two halves of the Yin Tiger Tally and places them together to commence the battle known as the Bloodbath of Nightless City. In the aftermath, Wei Wuxian staggers away.

You also fled along with him, because you were injured in the process as well, trying to protect Wei Wuxian.

Once the both of you return to the Burial Mounds, he sees your injures. And he realizes truly, how he fell. He should've protected you, not had you follow him around even when he was making mistakes, so, he kneels down, even with his own injures, and says,

"You idiot."

He means it in a way where he's frustrated with himself rather than you. "You idiot, do you realize you could've bene killed?! And for what?! To protect me!? I'm a mess! You should've left when you had the chance!" He says to your face, his expression desperate, he didn't want to see you hurt because of him, he'd die without you...