Why did Bai Xiaowen kill Heiwa?

Excuse me, why did Bai Xiaowen kill Heiwa?

I thought about two points, 1, because Bai Xiaowen was afraid of the ambiguous relationship between Heiwa and Xiaoe. Although Heiwa has indicated that he no longer cares about this matter, Bai Xiaowen is narrow-minded and afraid of Heiwa's revenge. It is better to strike first. 2. Heiwa influenced Bai Xiaowen's career, because Heiwa learned to be a good person and remained faithful. Unlike Bai Xiaowen, Heiwa is completely fighting for herself. As a deputy county magistrate, Heiwa will definitely affect his behavior as a county magistrate, so he left Heiwa behind.

These are my two thoughts about myself. I want to know your opinion. Maybe there are more reasons?

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