Attack of the Dragon Riders

As an accomplished adventurer.
Galen should have spent the rest of his life comfortably and happily within his own manor.
Until that day.
The dragon flapped its membranous wings and descended from the sky, leaving behind a dragon egg to give to Galen.
Galen: Hey hey, why are you letting me raise your own child?
Gargoyle: Just my child? O human with no sense of responsibility, what did you do that day?
What did you do that day, don't you know?
Galen:Just being a dragon rider ...... It's not so bad, is it?
:...
In order to earn formula money for his child still in his shell.
Galen had to revert to his old ways and embark on another adventure as a middle-aged uncle.
The sun will set, the afterglow is just right.
Although the youth is gone, the blood is still there.