Rough Hands
In actuality, it was not that easy for the police to invite someone like Han Shan for questioning. A famous businessman like him would've had his schedule filled until the end of the next year, and even if the Chief Commissioner went out of his way to invite Han Shan in person, they still needed to wait a few more days for him to make some space amidst his empty schedule.
However, it was unknown which Gods and demons were at work, Han Shan actually dropped everything and came to the police station with his staff that very same evening!
In order to get the arrest warrant for Cui Yan, Li Zhi already went to Director Zhang's office to make a direct report. He also told the director in passing that he had invited Han Shan and his staff back to the station. That's why as soon as Han Shan stepped through the door, he was directly welcomed by Director Zhang. After all, this time Han Shan's status was no longer a potential suspect, but a very important witness.