C612 The Secret of Azure Hill Stronghold

Now, he was very sure that this thing was kept by the Third Prince!

This meant that Lu Chen and Beihuang Qingchuan had fought in the Azure Hill Stronghold!

But the key question was, how did the Third Prince know? Was it only the Third Prince who knew, or was it that other princes knew?

But if the other princes knew, then it shouldn't be a secret