The Black-Lotus Male Supporting Character Is Hard to Conquer

Xue Tong Yun transmigrated into a cultivation novel and became the senior sister of Xue Jing Zhou, the apocalyptic villain.
The system told her that if she could “win over” Xue Jing Zhou and prevent him from destroying the world, she could return to reality.
However, she arrived at the timeline just as Xue Jing Zhou was about to unleash his wrath on the world.
Xue Tong Yun: “…”
Dear system, say that again if you dare.
To activate the mission, Xue Tong Yun, with the system’s help, used a time-reversal array to forcibly rewind the timeline by 100 years.
The once fearsome demon lord, who would make everyone tremble in fear a century later, was now just a fragile and wounded teenager.
A lad in bloodstained white robes seemed unaware of his injuries. His cold demeanor and ethereal presence were otherworldly.
Xue Tong Yun saved the battered Xue Jing Zhou and promised him that no matter what the future held, she would protect him.
This time, and countless times after, she stood before him, shielding him with her frail body.
Xue Jing Zhou couldn’t figure out what the senior sister who appeared out of nowhere meant.
Why did she, a complete stranger, risk her life repeatedly to protect him?
Even when he didn’t need it.
Upon realizing she mistakenly thought of him as weak and pitiful, he played along and stayed by her side, constantly testing her limits.
When she grabbed his neck, forbidding him from killing or committing evil, he felt a strange, intense yearning bloom within him.
At that moment, he decided—
It didn’t matter who she was. He just needed to keep her by his side.
He built her a magnificent palace, only to lock her within it with heavy chains.
“Senior Sister, when you first approached me, did you ever think you’d never escape?”
She replied, “Ah Zhou, I never intended to leave.”
But the hand she pressed to his chest betrayed her calm heart—her pulse did not waver.
When surrounded by righteous cultivators intent on killing him, Xue Jing Zhou hid his murderous aura and gently embraced Xue Tong Yun from behind, his voice tinged with grievance:
“Senior Sister, you promised to protect me forever. Don’t lie to me.”
“You’re all I have. Whether it’s heaven or hell, this life or the next, we’ll walk together.”