Although Gu Kaiyuan wasn't at the scene, he had already managed to coax the truth out of Gu Anwei and the others. His father's ruthlessness at that moment had terrified Gu Antong and the others who had witnessed the entire ordeal. Otherwise, Gu Antong wouldn't have been so frightened that she developed a high fever.
Even if Gu Kaiyuan had known earlier that Bai Suihe had such effective medicine, he still wouldn't have agreed to take it out. Besides being unable to explain its origins, he simply didn't trust the Gu Family. No one understood this family's true nature better than he did.
If the medicine he produced could heal his mother's wounds, he would undoubtedly be interrogated about where it came from. They might even use it as a bargaining chip to strike a deal with the Third Prince.
