Can you recommend a novel where the main character is a man being used?

There is a novel where the male protagonist is very happy to wait for his girlfriend at the same place
I remember the old place was a cafe
Girlfriend came but proposed to break up
It turns out that the woman has a fiance
Being with the male lead is just using him as a shield
It seems that his girlfriend's family is very rich, and so is his fiancé.
Then they said they broke up and left
I forgot about the rest
I only remember that the male protagonist seemed to have discovered that the male protagonist's family background was not ordinary either.
But the male protagonist relied on his own ability to take revenge.
It seems that he has a superpower
I forgot what ability it was.
Later, he tied up his ex-girlfriend's fiancé and took him to a deserted place.
And inject him with drugs
Let him come out and become a cripple
Then, the ex-girlfriend's family is afraid that the male lead will also take revenge
So the ex-girlfriend asked the male lead to meet at the old place
I only remember this part
Does anyone know which novel this is?

Answer 1

In the book,"If I Become a Demon," the male protagonist was plotted against by the demon dwellers when he was young. However, he entered the immortal sect and was later expelled. It turned out that the demon dwellers were using the male protagonist. In a dilemma, the male protagonist was forced. The immortal chased after the demon dwellers to resist the pressure. In the end, he became a demon with a thought and the male protagonist was used. I recommend this book. I hope you like this fairy's recommendation. Muah ~😗