This is a world where "soul contracts" are the source of power. Practitioners make contracts with heaven and earth, monsters, heroic spirits, and even themselves to gain strength. The protagonist, Ye Xuantian, was born able to see the "hidden clauses" and "loopholes in the wording" of contracts. By paying the lowest possible price, he leverages the most unimaginable power over the rules, becoming the world's most unscrupulous "contract master."