You're a treasure hunter. One day a mysterious man gives you the commission to get the 'crimson heart', it's rumored to be a rare jewel only to be found in the south.

In the middle of your journey you met a rich merchant name, Charon. He's a carefree and cheerful person but there's something odd about him, nevertheless, he accompanies your journey.

One day he said something shocking, "The jewel you looking for is actually my heart."