North region.
"Su Sheng gave you the coordinates of his location?" Lin Ze looked at the Blind Assassin in surprise as they changed their course when they arrived in the northern region.
Initially, they are traveling in the direction of the Xuan family. But the Blind Assassin suddenly instructed his horse to change direction. Even though Lin Ze is puzzled, he immediately follows the Blind Assassin. It is because he knows that the Blind Assassin wouldn't do things that are meaningless. He guessed that the Blind Assassin had a destination in mind, and it was only that note from Su Sheng that the Blind Assassin received recently.
So, Su Sheng must have given the Blind Assassin a location. And it is as he guessed when he heard the Blind Assassin's reply.
The Blind Assassin, Meng Xing, nodded in affirmation. "Yes," he answered as he urged the horse to go faster.