**Wong Dai**, also known as Bishop Won Dai, presides as the spiritual leader of the fictional city of Eden. He commands the E=X Bureau, the organization governing Eden's operations. His origins trace back to surviving the Megazone colony ship events centuries prior. This history grants him unique knowledge of humanity's spacefaring past and the artificial reality they inhabit.

Wong Dai launches Project Heaven, an initiative designed to transfer human consciousness into a digital realm for preservation. This project forms the core conflict of the narrative. During the climax, his confrontation with protagonist Eiji Takanaka triggers a pivotal revelation. Wong Dai's physical form deteriorates, unmasking his true identity as Shogo Yahagi, the protagonist from earlier series installments.

The recognition occurs when Eiji presents a specific data disc originally belonging to Shogo. Wong Dai's reaction—"That, I remember that!"—confirms their shared past. Immediately following this, his voice modulation shifts, shedding its artificial depth and reverting to a tone reminiscent of Shogo's original voice. This disclosure reframes his actions as those of a survivor striving to shape humanity's future based on past traumas and failures.

His role concludes in defeat during the confrontation. This outcome enables the EVE program to proceed with its original mission: deactivating the ADAM defense system and restoring Earth's habitability.