Chapter 390 - King's palace
Currently the culprit behind all of this is now waiting in his room for the news. If Sam was here then he could easily recognise this person because it was Kevin who previously showed hatred towards Sam. As you can guess, Kevin was from the house of Duke. A few days ago he went to those mercenaries and told them what to do.
Actually it was quite hard to move against someone inside of the city and because of this, he told those mercenaries to do everything when Sam left the city. After waiting for 2 days he finally today got the news that Sam did not go to the library and was going toward the warrior association.
Not only that after leaving the warrior association Sam also went toward the city gate so it was naturally proven that Sam most likely accepted some type of hunting mission.