This series is based on the theme of the seven deadly sins, and they are drawn into seven different characters and poured into seven metal coins. The seven deadly sins belong to the classification of human evils in Catholic teaching. Those who fall into this category can directly form other immoral behaviors or habits. The crimes are pride, envy, wrath, sloth, greed, gluttony, and lust. Pigs symbolize gluttony, a narrow view that "gluttony" equals wasting food. In a broad sense, it refers to being "addicted" to something, such as alcoholism, drug abuse, hoarding unnecessary items, indulging in gambling, and having fun instead of making progress, etc.
