"What was that sound?!"
At this moment, everyone was like startled birds, becoming extremely tense as soon as they heard a noise.
Luco sensed for a moment, then immediately said with a grim expression, "I didn't find anything."
However, just as he finished speaking, there was a faint "creak" from another level.
Everyone heard it clearly this time... it was the sound of a door opening.
The member closest to the sound of the door opening instinctively turned around, raised his gun, and fired a dozen bullets.
Yet apart from the door that was swaying from being shot at, there wasn't a single human shadow in the corridor.
"Is it those invisible things again?" someone asked in terror.
Luco continued sensing and then shook his head, "No, I still can't..."
"Heehee..." A girl's soft laughter suddenly sounded.
"Who is it!" Several Falcon members simultaneously turned toward the direction of the sound, with one of them shouting harshly.
But what they saw was only a fleeting shadow.
