Seize the Dart

During the Wanli Period of the Ming Dynasty, the public security was chaotic and banditry was rampant in a certain place in the south of the Yangtze River. The local thief leader "Mr. Su" has been tracked by the local government for many years, but no clues have been found and his whereabouts are mysterious. In order to celebrate the birthday of his father-in-law, who is serving as censor in the capital, the new prefect Zuo Zongyuan entrusted Ma Yidao, the head dart of the mighty bodyguard bureau, to escort the priceless purple jade Guanyin to the capital. Ma Yidao took the four masters of the escort agency to the capital, but the news that he was escorting the escort spread like wildfire throughout the world. For a time, people from all walks of life were eager to try, planning to wait for an opportunity to seize the dart on the road. Several people were traveling to Feiyundu, but encountered a heavy rainstorm on the way, so they had no choice but to stay at the Jinjia Inn. Unexpectedly, various experts had already discovered their whereabouts and laid ambush in the inn, waiting for them to take the bait. Who among these experts was "Mr. Su"?