Open a Pawn Shop in the Three Realms

I inherited a strange pawn shop. Grandpa said that everything can be used here, from a small tear to a country's destiny. At first, I just thought he was joking, until - the fox fairy came as love, in exchange for a hundred years of peace for her people; the sword fairy came as memory, in exchange for a god-killing sword; the dynasty prince came as conscience, in exchange for the supreme throne of Kowloon. I thought this was just a consensual transaction, until I found the record of grandpa pawning "family affection" in the deepest part of the ledger, in exchange for me... Growing up safely. And now, the prince who changed the world with love is standing at the door holding a blood-stained sword. He wants to...