Don't be fooled by Yan's frail and elderly appearance.
In his lifetime, he also employed the pretense of old age and benevolence to fool the police's investigations.
Privately, he was a quite infamous "bomber," and his choice of locations for explosions was also crowded places like malls, subway stations, or large hotels.
When the detectives finally locked on to this neighbor, who was well regarded but suffered from multiple diseases and had limited mobility, they all felt doubtful.
But the evidence was conclusive as the tactical police teams were certain of his hideout and burst through the door.
He nonchalantly pressed the detonator in his hand, carrying more than a dozen tactical officers with him in a massive explosion that tore them apart in an instant.
Because he had crossed the Yin Yang Road several times during his lifetime, he gained the opportunity to transform into a Yin Ghost.