Why is there a Harem Tag?! I have finished the story, Side Story and all. This isn't a Harem at all.
As you read, I promise that this novel is in now way any shape a Harem.
Throughout the story, the MC remains as the Dragons Teacher/Mentor, Father, and Guardian. Protecting, supporting, and guiding each of them.
Except for the Green of course, as from the start, she is shown to be interested to the MC. Though there's also a reason for her liking him, which is a heavy ass spoiler.