Pi Junzi was really doing it for Miao Yi's sake. However, Miao Yi didn't appreciate his goodwill and was suspicious of his intentions.
Miao Yi couldn't simply go along with his plan just like that. First, he had to make certain of several things. Otherwise, he might end up failing when he was all but confident of success. He asked, "Pi Junzi, why are you digging out caves all the way here?"
Pi Junzi smiled bitterly and replied, "Lord Niu, forgive me for being rude. But the reason I am digging out caves here is because of you."
"Because of me?" Miao Yi was confused.
Pi Junzi nodded. With a pained expression, he recounted the tragic events that led to his current situation.