Yaoi lovee 3.0's feed

At the end of the day, my hatred towards Yeonhu's father grows ten folds. Though I am curious as to why he brought Yeonhu there in the first place, I know it was to pay a debt, but the fact that the madam was willing to take him in rather quickly is sus. What relationship did the yeonhu's father had with the madam and young master's father? And why tf would he entrust yeonhu with a pedophile