In addition to the optimism of the protagonist, two points are also very touching. The mother's encouragement and understanding are the main motivation. And the principal who let him get rid of the embarrassment back then made him re-examine the world.
He is lucky to have such a persistent mother and such a wise teacher. But I don't know how many lucky people there are in this world.
Without such luck, optimism can only be grasped and created by itself.
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