The male protagonist probably knows that he should let go when he sees Yesha and Liangsha living in the hidden world. Yesha is a natural king. He has his own life and should not always be a "pet" of human beings (although I think the male protagonist sees Toothless as a friend). But this letting go makes the whole tribe lose the help of the dragon, and they are going to return to their former peaceful life. Just as in the fairy tale "The prince and the princess will live happily together from now on", the hero and heroine also live happily together. The last encounter is so sweet. Toothless and Hiccup have become fathers, with even more responsibility on their shoulders.
The male protagonist grows from a weak boy who is not favored by others to a chief who is convinced by everyone. This process is really hard. But I really admire him. He was too decisive in making decisions. It is very difficult to leave the people and things that you have always depended on. In addition, the male protagonist thinks that he is worthless, and he loses from the heart. Fortunately, the two most important women in his life have always supported him unconditionally, trusted him, and beat him from time to time. Fortunately, they finally waited for the transformation of the male protagonist.
Killing the villain really made me emotional. The male protagonist finally took off his prosthetic limb, saved himself and killed the villain. He couldn't help but say, "If you lose your horse, how can you know the good or the bad".
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