Why Have They All Traveled Through Time but Not Me?

When Xu Huai woke up in the morning, he found that the university dormitory group that had been silent for almost a year had exploded. Three college roommates all said in the group that they had traveled through time. One said that he had traveled to a wild world. One said that he had traveled to a fantasy world. Another one said that he traveled to the world of Xianxia. At first, Xu Huai thought his roommates were going crazy in the group because of too much work pressure, until one of his roommates sent him a [red envelope]. [A portion of animal milk from the wilderness can slightly improve physical fitness after drinking it] But damn, they're all in the same dormitory, why are they all traveling through time and I'm the only one not wearing one?