Although Jin was at work, he was notified by the System via his phone when cultivators tried the extra stage in the Halloween Instance. Particularly because he would like to personally watch over the cultivators who entered that stage since that was one of the parts he had added into the first version of the Halloween Instance.
The scenario for the Halloween Instance was initially designed to be solely on the island of Halloween Candies with Pyro Jack as the main antagonist of the entire instance. However, Jin felt that what the System did was inadequate since candy was not the only thing representing Halloween.
Perhaps for the System, it might mean something more symbolic since it was statistically proven that one quarter of the annual candy sales in the world were from Halloween events. Hence, it was a no-brainer why the System decided to choose Candies as the main focus of the theme.
