If he had been facing Li Fei, he might not have been so temperamental. Even upon their first meeting, he would have sensed the danger a person like that represented, but he knew that Sun Mingyuan definitely did not pose such a threat.
Whether it was based on what he knew of Sun Mingyuan before or from his actions up to the present, in his view, the mere fact that Sun Mingyuan had come here today meant that all his prior actions were deliberate. He had already seen signs that Sun Mingyuan was softening up when they talked last night.
Under these circumstances, Chen Song believed that Sun Mingyuan would also choose to be a dog for the Chu Family, regardless of whether Chu Yaoyao could truly represent the Chu Family or not. To Chen Song, this was irrelevant. Sun Mingyuan asking this question was clearly provocation, and Chen Song certainly wouldn't miss such a perfect opportunity to prove his worth.