It wasn't an HD video, but Zhang Hei could still recognize the figure appearing in the video as himself. He could also recognize the environment where he was recorded by the surveillance camera.
That was when he was allowed to leave the police station after being interrogated as a witness after Ren Qiao Lian died. At that time, his lawyer offered him a ride, but he refused, choosing to go somewhere else instead of going straight back to his company or home.
He chose to go to the old building where he used to teach boxing to children many years ago. His mind was in a mess, and he needed a quiet place to calm down. He just sat in the boxing ring, and his mind kept spinning even though he intended to rest it for a while. He was lost in thought while inside the old building, and he didn't notice at all when someone approached the door and even pretended to take something from the gap between the door and the floor.