To find out Lu Li’s identity was not that hard at all. If he had been staying at the Di Long Tribe, then it was possible that nobody would find out who he was.
However, once he rose and became outstanding, it would cause the families to be suspicious. They could make out Lu Li’s identity as long as they wanted to.
Lu Renhuang once made a huge scene at the Bai Emperor Mountain because of Ming Yu and he almost killed the Old Man of Heaven Prison. Granted, the Bai Family sealed off the information later on but there was no guarantee that there was absolutely no leak. Some families did get some information.
Many people had started to ask who Lu Li was after Ming Yu knelt to him and called him Young Master. Sure, Ming Yu did leave and never returned to the Blood Evil Island, but he did make an appearance not too long ago. The Ghost Mask could not shield off the psychic power of a Noble Lord Realm warrior after all.