Dressed As The Villain Master, But I Conquered The Heroine

The beautiful master who just wants to survive and survive vs the arrogant and sinister and paranoid apprentice
After being bound by the system in the early Yuan Dynasty, he was asked to rewrite the ending of the collapse of the demonic world of female patron Gu Xicheng and save the world.
The system told her that after she played the role of the heroine master well and completed the main mission according to the system mission prompts, she would be sent back to her original world plus 100 million as a reward.
That’s a whole 100 million, who wouldn’t be tempted if I let it go!
At the beginning of the Yuan Dynasty, he bowed his head to the God of Wealth. He only thought about how to complete the main plot line and survive until the finale.
But...
Who can tell her why the plot direction has changed?
And it became so outrageous??
Amidst the nostalgic calls of "Master", Yuanchu gradually discovered that his little apprentice looked at him in the wrong way.
In the end, Gu Xi, who could not escape the demon, looked at her with a peach-like face and eyes full of tenderness. He pinched her chin with his greasy-skinned fingers, and caressed her crimson cheek with his other hand. He lightly opened his red lips and leaned over to whisper in her ear: "Master, am I deceiving the master..." The lingering sound dissipated in sobs...
As the lights flickered out, there were many figures in the hibiscus tent, and their clothes were scattered all over the floor, overlapping each other...
"My disciple, be good, drink this medicine, it won't be bitter at all"
"Oh, it's so bitter, Master is good or bad, he is a big liar"
"Master, my disciple selfishly dragged you into this world of mortals, will you blame me?"
"No, I'm happy with it."