Because of the madness caused by a tragic love, that kind-hearted and unrealistic woman traveled through time and became Harry.
Rebirth, losing the memory of the previous life, and reuniting the broken soul. He has people who care about him: brother, cousin, friends.
Even if he is deeply involved in conspiracies and calculations, he is fearless. Because he has friends he trusts. And he always believes in his choice, even if he is shattered to pieces, he will not regret it.
Harry's rules for happiness:
1. The person I love also loves me
2. The people I love will always be happy and safe.
3. Eat chocolate and ice cream every day