A beloved villain in a BL manga often has a complex personality. They might have a tragic backstory or hidden vulnerabilities that make readers sympathize with them despite their villainous actions.
There are several options. Some dedicated manga reading apps like Manga Rock or ComiXology could have what you're looking for. Also, some websites specifically focused on BL content might have a good selection.
To survive as a villain in a BL manhwa, you have to be strategic. Understand the weaknesses of the heroes and exploit them. Also, build alliances when it suits you, but be ready to betray them if necessary.
Ren Zhuanpeng's novel, My Apprentices Are All Villains, was a popular fantasy novel. It was published on Qidian Chinese website and was loved by readers. The story described how Lu Zhou woke up and became the world's most powerful and oldest demon ancestor. He also had nine disciples who had committed heinous crimes and shocked the world. You can read authentic books and listen to authentic audio on the Qidian Reading App. The male lead, Lu Zhou, was a kind and conceited person who had transmigrated to the identity of the great demon's master.