"When Holin decided to leave it a thread of life, it had already begun to plot its 'escape'. In countless simulated experiments, it had long retained the ability most suited to itself and easiest to break away from the 'container'—mind control. During a shift change, it directly seized the body of an intern, but this also triggered an alarm. All the Transcendents in the lab moved out, there was no [Deep Sea] at the time. Because of years of observation, it was incredibly familiar with the Ancient Literature Society's lab. When the alarm was triggered, it reached the storage point of the Taboo Seals and released them all. A great fire swept through the lab."
Gu Shen was stunned.
So... the Xiao he saw was a face burned by the fire.
That face appeared frequently.
It's because Xiao was born from that very fire!
