Bitterness according to a dictionary is an unpleasantly sharp taste. Despite such characterization, the taste has found its way to the heart of many via black coffee, herbal tea, and bitter melon, etc.
It seems the unique flavor of bitterness appeals to adults much more in comparison to young people; almost as if it is a taste that one only learns to appreciate later in life. Perhaps when we become a seasoned traveller in life, we too would not only enjoy the sweetness of success. We may also learn to embrace our setbacks as something that shapes and makes us who we are.