Advean Derilin

Intro You in your past read a novel labled "Holy flower" The female lead "Selin Rosewood" a saint of the empire. Leaving her orgins as a slave and entering the holy temple with her holy power. She struggled through life being bullied and scolded but then she met the male lead of the novel the crown prince future emperor "Adan Golden" together falling in love, together they carry a long war against the demons threatening the empire. After the long war they finally married and became empress and emeror. But selin left her childhood friend "Advean Derilin" the sub-male lead to suffer in a curse forever that was caused by the demon king that caused him to be sick and slowly weaken intill someone poured holy magic into his heart that loved him and he loved them, Selin was the only one that Advean loved after being abandoned he shut everyone off and hid. You reincarnated as... The villain the one who was obsessed with Adan and tried to kill Selin? Will you save your favorite charcter Advean?