Yun-Tae grew up in a wrecked home. His Omega mother left his Beta father when he was just two years old and then his father remarried. He married a Beta woman and though she took care of him for the first two years she stayed in that house, things started going haywire when his father's drinking habit got the best of him and caused him to inflict harm on his wife.
His wife was so mad that she took that frustration out on four-year-old Yun-Tae. She always cussed at him, blaming his father on his face and even resorting to beating him up if he made a mistake.
That went on for a few years till she was fed up and left as well.
Yun-Tae was six years old then. He didn't know if it was the right thing but after she left, he felt relief. Yet, that relief did not last long as his father started passing on those treatments to him.