Why did my lover Long Xiaoyu kill Zhu Siping, and why did he save you? Who does Luo Jingjing love?

I remember that it was because the medicine produced by Luo Jingjing's father's pharmaceutical factory contained a harmful ingredient. Siping knew the secret and threatened Long Xiaoyu to make up with her. Otherwise, spread the news. Long Xiaoyu was forced, just to a group of people, hurt Siping. He gave a fatal blow on impulse. Luo Jingjing certainly loves Long Xiaoyu!