I'm not sure specifically what the 'chasm game story' is about as it could be a very unique or niche story. It might be about a game that involves a chasm in some way, like a character having to cross it or something being hidden in the chasm within the game's plot.
Yes, in many games it is possible to finish side quests like the Carnan quest even after completing the main story. This is often designed to give players more flexibility and to allow them to fully explore the game world and all it has to offer.
Well, usually, when you finish the story quest in God of War, you could get access to bonus content, like additional side quests or maybe some powerful equipment. Sometimes, it might even trigger a new game plus mode for a more challenging playthrough.
Since I don't know the details of the 'chasm game story', I can't say for sure who the main characters are. They could be typical game characters like a brave warrior, a clever mage, or a stealthy thief.
We can conclude that the game is a role-playing mobile game with the characteristics of Xianxia, Chinese style, and horizontal version. According to the feedback from the players and the media ratings, most of the players approved of the game and thought it was fun. However, the game's content, plot, and other aspects were not found in the search results. Therefore, we can't give a definite answer to the overall evaluation of 'Search for Immortals'.
You can usually report a quest by communicating it to the relevant authority or character within the fictional world. It might involve filling out a form or having a direct conversation.