Half an hour later, Yang Fei and Mi Xuan had arrived at West City Jinma Residential Area in Yannan City.
Professor Cheng's laboratory and residence were right here.
Yang Fei and Mi Xuan were stopped by security outside the residential area.
Yang Fei had no choice but to call Professor Cheng and ask him to come out and greet them.
Three minutes later, a person staggered out from within the residential complex.
His hair was unkept and dirty, he wore thick glasses like the bottom of a wine bottle, he walked unsteadily, and his gaze was vacant.
Yang Fei was shocked.
He recognized this person at a glance as Song Shijie, one of Professor Cheng's students.
However, he couldn't understand how Song Shijie had become so slovenly in just under two months.
Song Shijie walked to the gate of the complex like a Night Patrol Deity, his gaze utterly unfocused.
Yang Fei patted him on the shoulder.
