C90 Talking Heart to Heart

Ye Feng set off the alarm because he failed to detect the infrared beams.

These beams were incredibly covert to Ye Feng; he couldn't pinpoint their origin.

Thus, inadvertently brushing against them alerted others to his presence.

While it was clear someone had entered, his identity remained unknown, affording Ye Feng a brief window to conceal himself.

Despite his cautious movements