The Same River Twice (джен)

Nie Mingjue would be the very first to admit that devious plotting was not his strong suit – but if it meant he could make things better, make it so that his brother never had to dirty his hands to avenge him, he would do his best.
His best, in this instance, was a forbidden ritual that sent him back in time to before their father had died, before Wen Ruohan's perfidy was revealed, before Meng Yao was twisted by the world's cruelty, before Wei Wuxian was orphaned...
Nie Mingjue had a lot to do and very little time in which to do it. Best to get started right away.