Jiang Yi Yi is a graduate student majoring in artificial intelligence. Ever since her twin sister passed away, she has been carrying a sense of guilt and has been determined to develop an AI that can "resurrect" her sister. This led her to be enter the world OG "Al Guru", Gu Yu. Gu Yu, althouth hailed as a master in the field of AI, has a little-known mental illness. He has been searching for his childhood "Green Plum" to cure his illness, but by coincidence, he found Yi Yi, the older sister of his "Green Plum".