The past (a)

Aaron paused in the middle of his speech for a brief moment, and in that very moment, his eyes turned crimson, showing that he was feeling highly emotional, and only then did he continue, "No! I am sure that the countermeasures I left in place would've been enough for you to deal with the crimson one. I believe that not only because I trust in my abilities but also because you're my son, and I believe in you. I'm sure that you would've grown strong enough to reseal it by the time it would've managed to escape from the space created by the nine seals."

A thoughtful look flashed across Vincent's eyes. Most of what had happened to him were all designated by his father.

His father left behind his most fabulous lucky encounter.

Afterward, he guided him to the place where he could safely become strong enough to hunt beasts.

Then, there were many events connected to him.