This is also a transmigration novel but with a rare-ish plot or MC Bai Fanlu transmigrates into a powerful demon lord with the same name who was originally a promising immortal cultivated but transcended into the demonic path because of his love for the protagonist he didn't like the plot and pitied the poor man and joined the defense army therefor giving a reason for the great system gods to transmigrate him into the novel lol 

From the OG description:

System: [Giving you a chance to prove yourself.] Bai Fanlu: [?] System: [Persevere and do not become a villain to the end, and you can return home when the male lead is done with saving the world.] Bai Fanlu: [...What if I become a villain?] System: [Then of course you will end up as cannon fodder.]

Bai Fanlu has a plan. In order to not become a villain, he has to adhere to three principles:

Do not have any physical contact with the main lead.

Do not have any grudge entanglement with the main lead.

Do not have any emotional interaction with the main lead.

However, nothing went as planned...

I rate this one 8/10