As a G-class shield warrior at the bottom of the dungeon, Yu Fang's biggest dream is to get out of every instance alive.
Until that day, when he was about to die, his heart was dug out by the Clown King who was entrenched deep in the underground city, and he stuffed a jar of "candy worms" into it.
"From today on, you are my king's slave."
A blank Prismatic Card became his contract of betrayal.
The gears of fate have also begun to turn...