that dungeon portal has been made by sun jinwoo aka his father that will hone him to become his successor of power or shadow monarch but in this fan-fic his son didn't take it I guess
The old man turned his head as his eyes met with the young man beside him and replied. "Even if I did take your powers, father, I know that I would never be able to do a better job than you, and it would break my heart to see you die instead of me". Tears fell down in steady streams from his face as he smiled again before turning to face the ceiling.
Action · Daovenerable
pretty sure it's sun Goku
But there is a problem that Sun Wukong is very likely not born at this time. Where to find Sharu.
Dragon Ball: Lao Tzu is Sharu
Anime & Comics · Copia_San