Glenn's lair was huge. It was no secret but a widely known fact that Glenn had built a dungeon here.
An Zhengliang had not expected that they could really made it into Glenn's base. He had already planned to withdraw in the quickest way possible once they were exposed. For whatever it was, as a team leader, it was his duty to protect his team members as well as the two young girls from Min City Military School—even if he had to sacrifice himself, he had to ensure their safety!
It was just that An Zhengliang did not expect to have just entered Glenn's lair within ten short minutes!
As for the dungeon in the lair, it was not a huge secret. Any reputational person in the world knew about it. Even without the status, one could ask in an international setting and people would tell them about it.