The Bamboo Horse Killed the Killer, I Went Crazy!

Childhood Sweethearts Were Friends with Each Other Since They Were Young. the Sweethearts Were Extremely Possessive and Later Turned Evil.

Suddenly, I really want to read about childhood sweethearts. I want to ask all my book friends if they have any stories about childhood sweethearts. They grew up together and like to tease each other. The male protagonist likes the female protagonist and always teases her. He is extremely possessive. After the female protagonist falls in love, the male protagonist begins to turn evil and starts to take action.