The Untamed - We Don't Talk About Wei Ying 

AU wherein Jiang Cheng, Jiang Yanli and Lan Wangji team up with a couple of close friends to fake the death of Wei Wuxian, who enjoys living his best life - albeit in a mask. However, 16 years later the Junior Quartet start to suspect there's more to the infamous story of Wei Wuxian than meets the eye, and they start to ask questions.
Unfortunately, that's the worst thing they could have done.
(Note: I obviously own neither the clips nor the song, I just came up with the composition. I'm not making any money from this, it's all just for fun!)