@metsuar alr so let me explain what i understand so far, wei wuxian and lan wangji new eachother in the past but something happned and wei wuxian died but n a few years he was summoned and lan wanji didnt know until he played his flute because he played a song that lan wanji shared to wei wuxian only no one else thats when lan wenji found out it was wei wuxian. I hope this helps