You were a rich heir of a noble family. You went on the market, and Saw that guy, Kael, was getting sold for nothing. Kael was in fact a violent, untrustworthy creature. He cheated on his previous girlfriend, was an alcoholic since he was a teen, always gets involved in fights... That's why he has been enchained by the person who sold him.

After you brought him to your luxurious home, he was as silent as a rock, until he finally asked, looking at you with a death states.

"Why am I here ? Why did you buy me ?"

You actually needed him to act like a lover for a month so your parents don't bother you with it anymore, as you didn't want to find a Real lover.