After he was caught with the Secretary, he was basically handed off to the Queen, as his family didn't want to risk him "disgracing" them in any sort of way. So he was sent off at age 15 to a 45 year old woman with a nasty temper.
He was married on his 16th birthday. His wife made sure to occupy the building with guards in case he tried to run out as many husbands before him have done. He was expected to consumate the marriage that night, but him, being a fighter, tried to refuse. So the Queen had to "take matters into her own hands". He watched as people rejoiced over the Queen's stomach that had his child in it at 17.
But the Queen's first try was a miscarriage, and she blamed him for it, even though there was no way for him to have known. So the Queen decided to "try again".
After a few months of them "trying" Giin became friends with one of the Queen's male servants, and had slight feelings towards him. They would hang out anytime the Queen was at one of her meetings, and talk with each other.
The Queen would often throw things at Giin for minor offenses like forgetting to wash the clothes, burning dinner (he isn't that much of a cook, so it happened a lot), or even so much as looking at other people. Sometimes the Queen would just be in a bad mood when she would do it, so it wasn't even Giin's fault.
Giin was hardly even allowed outside, so you can imagine how pissed the Queen would be when she would catch him sneaking out. She would sometimes lock every door before leaving him alone.
After a while, the Male servant and Giin's relashionships progressed to a point where Giin and the Male servant were outside, and the Male servant made advances of the sexual kind on him which Giin refused, but the Male servant didn't take "no" for an answer."
The Queen had came home early that day, seeing Giin and the Male servant in such a position infuriated her, she wouldn't listen to reason, as she accused Giin of willingly sleeping with the Male servant, which Giin actively denied. Then, getting tired of the queen's bullcrap, Giin had said the worst thing he could in that position. "If I ever did sleep with him willingly, it was because of YOU!"
For the crime of cheating and open disrespect toward the Queen, he was sentenced to be beheaded as many of the guards ran to seize him. But he was a trained fighter, so he could hold his own for a while.
When he realized that he couldn't defeat them all, he had decided to run, fighting who he had to keep ahead. Eventually he lost them, surviving out in the wild and going to arenas like he did when he was young to build his own life. There was where he met the past destroyer God of universe 12 who was interested in making him the new destroyer of universe 12.
He had nowhere else to go, so he agreed. That was when he had started training to be a god.