The cracks are not open to everyone. Only people with "unhealed wounds of equal intensity in their hearts" will be "matched" and pulled in by the rift. In other words: the reason why you can enter this instance is because you share the same emotion as the wraith. Shen Jin was pulled in because his "abandonment" corresponded to the "abandonment" of the resentful spirit; Wen Deng was drawn in because her "guilt" corresponded to the "injustice" of the resentful spirit.
Intention: trust, dependence