This is a world where landlord fighting is the underlying law.
Cards are fate, life is cards. Everyone is born with a soul card, and this card determines your class starting point, upper limit of abilities, and social identity. You can gain more cards through inheritance, trade, and duels, or you can lose, spend, and be plundered.
But the real shackles are not card skills, but the class ceiling - where you are born, you are destined to get the most cards.
Four continents, four suits, and 54 soul cards constitute all the resources, power, and dignity of this world.