Years ago, the Doom organization had been seeking Jing Zhen for that technology, but Jing Zhen hid in the most populous area, Huaxia, and vanished from Doom's sight.
Years ago, Doom sent people to Huaxia to capture Shen Bijun, hoping to force Jing Zhen to comply. However, Jing Zhen didn't hand over the technology, leading to Shen Bijun being trapped in a basement for over half a year.
But there is a saying, "Grandchildren are closer to their grandparents."
Song Chen believed that Jing Zhen might endure seeing his daughter suffer but would never allow his granddaughter to endure the same.
-
Song Chen's guess was indeed correct.
Now, Jing Zhen was beside himself with worry. He even wished he could just die!
If only he could disappear from this world with that technology, perhaps Doom would stop pursuing them relentlessly.
If only he hadn't dedicated his youth to this research, perhaps they wouldn't be in such a dire situation now!