As Ling Chen appeared, the men guarding both sides of the corridor merely glanced at him without scrutinizing. In their view, he was certainly one of their own; no outsiders could mix into the mountain top. As he approached, Ling Chen hesitated for a moment, abandoning the idea of taking action, and walked directly inside. He initially planned to handle these guards, then have Yu Beifeng and Chen Junfeng join him.
Since they didn't detect him, it would be better for him to go in first and ascertain the situation inside. That way, he would be prepared if he needed to make a move later. At the end of the corridor, Ling Chen found that there were doors on both sides.
