The protagonist Lin Yuan travels to a world made of cards. Each person has 7 card slots, but there are conditions to unlock the card slots. The card qualities are white, green, blue, purple, gold, red and black, and the coins are copper coins, silver coins, gold coins, spiritual crystals, source crystals, fairy crystals and divine crystals. Card types include identity cards, equipment cards, beast cards, skill cards, material cards, rare object cards, and element cards. Lin Yuan became king by constantly upgrading his cards.
