In the context of global warming and species extinction, the material image of "death (inanimate)" or "instrumentalization" cuts off human contact and communication with plants, while the silent and autonomous nature of plants stimulates our speculation and imagination about them. "KZ's Diary is an experiential design project based on speculative fiction. Combining media such as video, physical installations and VR, the project invites the audience to speculate on the future of humans and plants, to envision a way of caring for and reciprocating with plants, and to embrace our inextricable relationship with them in the world.