Upon seeing someone blocking her way, Ling Fei immediately sensed something fishy about the entire situation!
Ma Xidan is dead, but he definitely did not die at the hands of Li Huai. Instead, he was killed by someone, or a group of people, who manipulated everything behind the scenes. All of this was done to frame Li Huai.
Perhaps the other party knew of Li Huai's strength and found him a hard target. Therefore, they opted to utilize the weapon of law. Despite appearing reasonable on the surface, it was merely a despicable and crude tactic.
Not only were they abusing the law for the wrongdoings, they also used her. The reason she was sent to arrest Li Huai was precisely because the other party knew about her relationship with him. They knew that as long as she was the one to confront him, there was a higher chance that Li Huai wouldn't resist.