Tomb raiding notes: what did the Wang family come for?

Well, how can I put it? Wang Zanghai should have two purposes. One is immortality (which should be the main reason). Second, I want to know what is the secret of the Zhang family's guard (in my opinion, he is purely boring and goes looking for trouble, and the Zhang family is guarding a secret. If he has nothing to do, he will make trouble and give others some trouble. It is purely boring and idle. . )

After that, the Wangs should be: one is to fulfill the wishes of their ancestors, and the other is to live forever.

"It" should be a government organization, and many local governments are involved. And powerful.