Chief Engin, the second dwarf, and Sadrigh just were not aware that Tang Shaoyang knew their farce. He could feel their feelings, and he could tell when Chief Engin rebutted Sadrigh, the Chief was not that angry. The old man was too calm to do the acting.
As he walked up the stairs, he glanced at Ashley. "That's an excellent offer there. I never thought of asking them to be my vassal at all." He thought they loved living underground, so it was useless to offer them to join him.
However, from their reaction, there was a chance the dwarves would join his empire. Chief Engin did not immediately reject the offer. That was a sign that the dwarf was considering joining his empire. Especially after Ashley said he came from a lower world that was a few months old. He could feel emotional fluctuation from Chief Engin. It was more to excitement.