Fu Yu lost his memories as a child and was accidentally found by Ge Tian, Sword Venerable of Guiyi Sect. Because he had the same mutated ice spirit root as Ge Tian, the Sword Venerable took him in as a disciple. As the years passed and the world changed, the Immortal Venerable Ge Tian gradually withdrew from public life, while Fu Yu became one of the sect's foremost Immortal Venerables and took on a young disciple of his own.
After surviving the Nascent Soul tribulation and reaching the threshold of Deification, Fu Yu gradually recovered his memories. He remembered that he was actually Huan Yan, the renowned leader of the demonic path. To escape the death tribulation destined for him, he had split off a divine incarnation and assumed a new identity to deceive the Heavenly Dao.
He has no idea whether the Heavenly Dao was fooled, but everyone in the immortal sects now considers him the undisputed leader of the righteous path :)
Fu Yu, who tried to escape his death tribulation with an incarnation and deceive Heaven, chooses to endure the humiliation and keep playing the role of an Immortal Venerable.
But as a Deification cultivator, he's not exactly at risk of being killed by someone with nothing better to do. So Fu Yu comes up with a brilliant plan: I'll kill myself and see if I can get through the death tribulation.
He returns to his true self and orders his subordinates to attack the immortal sects. At the same time, as the foremost Immortal Venerable of Guiyi Sect, the greatest sect under Heaven, Fu Yu naturally has to join the battle. If his true self kills him, then even if he fails to overcome the tribulation, he can reclaim his identity and recover the power of his incarnation.
Who could have guessed that everyone in Guiyi Sect would risk their lives to save him, and actually manage to bring Fu Yu back from the brink?
Fu Yu: ...
Fu Yu has no choice but to come up with other ways to find his true self or get himself killed, but his friends and fellow disciples save him every time.
After all these entanglements, stories begin circulating throughout the cultivation world about Immortal Venerable Huai Ling and Demonic Venerable Huan Yan, their love and rivalry, and their moving, tragic romance (...). The rumors about them being in love supposedly started among the demonic cultivators, who claim that their Demonic Venerable never lets them kill the enemy when they go into battle.
The stories, ahem, the rumors keep spreading, and even his well-behaved young disciple starts looking at him strangely.
Then one day, after doggedly persisting, Fu Yu finally reaches his true self's palace. Just as he's about to kill himself, or rather, reclaim his incarnation, his disciple storms in, sword dripping with blood. But when he sees his master in both black and white looking back at him at the same time, he freezes.
Fu Yu: Save... I just wanted to get through a tribulation.
Theme: No matter where we are, we should keep striving to grow stronger and make the world a better place