Yu Ming was going to go to the demon realm alone. He didn't want to bring anyone along when he was going to face Xue Mingyu. Luckily, he managed to convince Bai Chen, and Wu Jinhai also agreed with what he said as he immediately said he would bring Bai Chen to the Xinyang Imperial Palace.
The arrangement was ideal for Yu Ming, and he would almost have felt satisfied if Wu Jingguo had not suddenly said, "I will go with you to the demon realm, Yu Ming."
Wu Jingguo's decision was not something Yu Ming wanted to hear, but he actually expected that the Second Prince of Wu Li would say that when he was about to go alone to the demon realm.
Of course, Yu Ming didn't grant his wish right away, saying that Wu Jingguo was still recovering from his injury, and that was why he suggested the Second Prince return to the Xinyang Imperial Palace with Wu Jinhai and Bai Chen.