Fear...
Fear is something inherent in human beings.
Fundamentally, it is an emotion that helps them survive, alerting them to possible dangers and preparing them to react appropriately.
When humans feel fear, their organisms go on alert and their hearts start beating faster, their breathing speeds up as well, and their bodies prepare to attack or flee.
However, there is a select group of humans who are practically incapable of feeling this emotion that is so natural to other people. Let's call the people in this group the fearless.
Even when the fearless are faced with an extremely frightening situation, they don't get scared or intimidated like normal humans. This may be because they are overconfident, or because they have developed a protective mechanism that prevents them from feeling fear. Regardless of the cause, the fact is that these people are able to face the most fearsome things without feeling fear.
