My ex-boyfriend cheated on me with my sister, and I got married to him in a flash; he went crazy.

[Flash marriage + marriage of convenience to love + second male lead takes over + pretending to be weak while actually being strong + scumbag boyfriend chasing after his wife in a dramatic way + sweet romance + both leads are virgins]
Caught in the act of sleeping with her boyfriend of two years and her younger sister, the younger sister, tears streaming down her face, buried herself in the man's arms: "Sister, Mingze and I are truly in love. In a relationship involving three people, the one who isn't loved is the third party!"
The boyfriend retorted even more defiantly, "Qing'er is gentle and lovely, unlike you who's so domineering! Get lost and stop bothering me!"
What a pair of scumbags and bitches!
Jiang Shutong turned around with a cold laugh, casually grabbed a stranger, and got married in a flash.
When she first got married, she mistakenly thought her husband was gay, and from then on she let herself go at home—wearing tank tops and short skirts at will, and walking around without a bra was a daily routine.
But gradually, the man's gaze towards her grew increasingly intense, and his Adam's apple bobbed more and more frequently.
Jiang Shutong panicked: Holy crap, did she somehow manage to turn a gay man straight?!
After switching jobs to Boyu Group, Jiang Shutong accidentally discovered that the legendary strict and demanding president was actually her husband whom she had married in a flash!
Jiang Shutong, enraged by the deception, outwardly remained calm as he continued to play dumb, while secretly contacting a divorce lawyer, determined to seize the enormous sum of money and flee in style.
The next second, the man, holding a stack of property deeds, bank cards, and share transfer agreements, his eyes red-rimmed, pulled her tightly into his arms: "Sweetie, all the family assets are yours, okay? Don't divorce me, alright?"
Later, she accidentally learned that he harbored a secret crush, and she coldly withdrew, saying, "President Pei, I won't be a substitute."
The man gripped her wrist, a obsessive obsession churning in his eyes, his voice hoarse and trembling: "You're not a substitute..."