Blackmailer's identity

As the cab drove off the street, they saw a very familiar black sedan drive in, and both Yun and Jinhai turned around in their seats to check the plate number.

"Am I... the only one who thinks that plate number looks familiar?" Jinhai asked.

"Stop the car!" Yun ordered the cab driver who quickly stepped on the brake. From the look on Yun's face Jinhai confirmed they were both thinking the same thing. They both watched the car drive slowly until it stopped in front of the house they had been watching. They both held their breaths when they saw a man step out. He was dressed casually and not in the usual suit he always wore when leaving the house. He was their mother's husband. Surprsingly, they both didn't look very surprised seeing him there. 

"It's him." Jinhai said. 

"Or maybe he just found the blackmailer just like us." Yun said, even though he knew the probability of that being the case was very slim.