Oathbreaker: A Dark Fantasy Web Serial - Chapter 12Arc 4: : Fallen Knight’s Sin

This is a story about a badass,

Humiliated by her ex-boyfriend's mother, Song Qiao was forced to end her first love. Facing the cold sarcasm from her half-sister, on the street in a fit of anger, she randomly grabbed a man, “Sir, do you have a girlfriend? If not, let's get married!”The man squinted at her and nodded, “Sure!”Marrying Lu Jingchen, Song Qiao received the utmost pampering, but just when she was falling for it, she discovered the reason behind everything...Five years later, Song Qiao made a strong return. Just as she stepped into An City's international airport, she was directly apprehended, and she was greeted with the squinting smile of a man, “Mrs. Lu, after traveling for five years, have you missed me and our son?”However, Song Qiao remained unfazed, her red lips slightly parted, “Sorry, Mr. Lu, we are already divorced. Please call me ex-wife!”The man was indifferent, pulling her into his arms, “I haven't signed the divorce agreement, and I haven't gone through the divorce procedures. How could there be an ex-wife to talk about?”

Xiao Chen, “the waste” of Xiao clan, had his engagement to the Young Lady of the Yang clan renounced.

And when he arrived at the sect that sympathized with him and took him in, he found corpses strewn all over the place and a mist of blood in the air. The sect was exterminated by a mysterious group that was looking for the ‘Wind Spirit Jade’.

He himself was left behind only half-dead for ‘wastes do not deserve to die by their hand’. Humiliated once more and on the verge of death, in the surroundings strangeness happened. A whirlpool sucked up the blood mist and diverted it into Xiao Chen’s forehead, transforming and enhancing his body.

- Description from Novelupdates

For the wine to be drunk on her wedding night to actually have been a cup of poison and for the one to poison her to be her husband, who would believe it?