Who Wants to Fall in Love with an Old Enemy?

[Two male protagonists + mutual attacks + bloody battles + reunion + falling in love and killing each other + two villains] [Wealthy, world-weary, gentle lunatic ✘Dark, inferior, arrogant, evil person] Yun Jianshan✘Liang Zhao A few years ago, Liang Zhao personally sent Yun Jianshan to prison. A few years later, Yun Jianshan was released from prison. The proud man who was once so high in the sky now has nothing; but Liang Zhao, who was humble at the time, now stands in a position that is beyond his reach. The moment the blade touched his chest, Liang Zhao smiled. There was no fear, no struggle - he just looked at Yunmi Mountain quietly, like looking at a rainstorm that was three years late. "If this is what you want, take it." But Yun Jianshan's hands were trembling. He had hated this man for three years and thought that this knife would kill him without hesitation. Until the truth is thrown out lightly—— "Your dad killed my dad." … One second after the camera turns off. Yun Jianshan tilted his head and leaned on the back seat with a smile on his face: "You did a really good job. You enjoyed it so much? Then why didn't you die three years ago?" Liang Zhao wiped away the non-existent tears and replied expressionlessly: "To each other." - What kind of pot goes with what kind of lid? The protagonists are all not pure and good. Please do not dismantle CP or make personal attacks (don't scold me (๑ŏ ŏ๑))