He wasn't like this in the novel. In the novel he was more like a pushover, he was a bland character because it's mostly focused on the people around him and the way he changed their lives. In the novel he would give everything to them especially to Theo and Keung who would grow up really spoiled that a lot of readers got annoyed at them for taking advantage of mc's kindness. He needs to grow more or have more power, he needs to eat lots of things but because of Keung who likes to eat and the people around him, they always take almost all of the good things. He is selfish yes, but he doesn't step on the line.
Like he feels happy taking the orb even if it means his friends/workers are uncomfortable and he all around only thinks about becoming famous outside of the tower or being more powerful even at the expense of the animals it’s just really sad because most of the animals only became friends with him because they thought he was nice but he’s not nice and doesn’t even have that bad of a past he just wasn’t able to go to the tower like every other person who wasn’t rich