Zhao Jia, using the alias Zhao Yongwei, had moved here only two days ago.
His reason for moving was singular: to ensure that Gong Lao would die today.
The meaning of 'ensure' is that if Gong Lao fulfilled their agreement to end their life today, he would play the role of a helpful neighbor, timely arriving at the scene to help extinguish the fire, protect the scene and the suicide note;
However, if Gong Lao hesitated at the last moment and did not fulfill their vow, he would have to help Gong Lao muster the courage to complete the mission.
It can't be helped; too many people in this world are untrustworthy.
Many people, who clearly promised to do well, back out at the crucial moment. It's not that the people behind Zhao Jia don't trust Gong Lao, but an additional layer of 'insurance' is also for safety.
This isn't just to be responsible for Gong Lao but also for the more than 100 prison guards sacrificing today on Death Row. They absolutely must not die in vain.
