On the Day We Divorced, I Kicked My Scumbag Husband to the Curb and Married His Rival While Pregnant

They Married First and Fell in Love Later. She Got Pregnant, He Asked for a Divorce, and Then They Repeated the Same Mistakes

The heroine's mother saved the hero's parents, and then the hero married the heroine. He did his duty as a husband during their marriage, but they later separated because of some misunderstandings. When the hero found out the heroine had run away while pregnant, he was so furious he fainted.