This is a world of immortality that has been pushed to the brink of collapse by the "involution of immortality" - the Xuanhuang Realm.
Thousands of years ago, the Xuanhuang Realm was full of spiritual energy, and monks could break through by following the way of heaven. However, for thousands of years, monks have been frantically involving themselves, grabbing resources, fighting for cultivation, killing fellow disciples, and annihilating sects. The extreme degree of involution has led to the accelerated depletion of spiritual energy. The higher the cultivation level of monks, the more ruthlessly they plunder spiritual energy. The whole world has fallen into an endless cycle of "the more you absorb, the less spiritual energy you have, and the less spiritual energy you have to absorb."
Tiandao was forced into desperation and gave the last chance of life: whoever can stop involution, comply with Tiandao, and lie down and do nothing, will receive the gifts of Tiandao, and his cultivation will advance by leaps and bounds.
And our protagonist is the "Heaven-chosen man" chosen by Heaven.