After their deaths, Jiang Fengmian, Madam Yu, Jiang Yanli, and Jin Zixuan came back as ghosts witnessing everything that had happened and just how awful the world is. They also see Wei Ying's true reasoning and his sufferings leading up to his death wishing they could do something to help him. Or the events of MDSZ in the perspective of the Jiangs and Zixuan (heavily inspired by Ghost of Lotus Pier by Nika_Raven_Celeste on ao3, I highly recommend it!)