Yang Liwei ordered someone to take the body of Yang Wudi from the secret realm.
He opened the secret realm again to let that person pass; he and the sect master wouldn't be able to go personally. If they went inside, the secret realm would collapse in their presence alone.
Their level of life is high compared to the rules of secret realms, so they send a god-king realm expert to take his body as soon as possible.
During the month that Yang Wudi trained under him, he developed some affection for him as a son. He didn't have any sons or grandsons to take care of, so he decided to consider Yang Wudi as his grandson and also gave him a Tier 4 talisman to save his life in case of any possible danger.
Unfortunately, Yang Wudi died inside the secret realm; it was the reason Yang Liwei was angry since it happened under his supervision.
Soon, the person who went to take Yang Wudi's body arrived.
