I was born with a lucky koi's fortune, and helped my ordinary farmer foster parents rise to the ranks of the wealthiest people in the country. After I returned to my biological parents' home, they treated me with contempt and even locked me in a storage room, giving me only one meal a day. When my foster parents found out, they flew into a rage and gave up on exchanging me for their biological daughter once and for all. When that family discovered that we were truly rich, not poor, they regretted everything and begged us desperately to accept them. Too bad it was too late. Their family went bankrupt, and their lives only got worse from then on.