What Diary of a Billionaire's Daughter-in-Law(DUBBED) is about
Bae Jia has a one-night stand with rich heir Kim Minhyuk, who has poor sperm motility, and becomes pregnant. Due to her friend's and his first love's scheming, she loses the child and dies. Reborn at the moment she discovers the pregnancy, she swears that she will protect her baby and rewrite her fate this time.
