My Name Is Zhen Kaixin, but I Am Not Happy

In a certain parallel world, when the pain and suffering in various places reached its peak, an existence called the beast of sorrow was formed, causing trouble and chaos in the world. At this moment, a mysterious organization suddenly appeared, specializing in hunting and saving these miserable beasts, and mankind had a brief period of peace. Zhen Kaixin traveled to this parallel world because of an accident and started his adventure.