Responses
I agree. I think this was largely influenced by his likeability. In the beginning he had a more sinister vibe which was thrown out of the plot to maintain his popularity and general popularity of the manhwa but that just ended up ruining his character and role in the plot as it was originally intended. For the most part he feels like filler material than a well though out part of the plot. The author tries to make him important but so much of his character arc is so out of place with the main plot. Eventually he is only left as the nice guy down bad for a man that doesn't want him.
I keep thinking how bad the authors fucked up. The startup for this story started for Cain and even the title belongs to him but he became the 3rd character and the author tried so hard to keep his story in not realizing they should've saved his story for another time because they just changed to much of their original thought. That's why Cain feels out of place for some readers. There was literally no point in making this a love triangle. Cain backstory is only important if the MC remembered too.
Anyway, im glad Cain is happy and travelling and tbh I think he's the real winner here.