Citizen Li Chang had been receiving rehabilitation care at a rehabilitation center in Shanghai. At the end of March, as pandemic control measures were tightened, the center identified positive cases, and all personnel, including caregivers, were required to go into quarantine. However, due to his illness, Li Chang had not yet regained his speech abilities and had no mobility, relying heavily on the care provided by the staff. It was under these circumstances — with professional caregivers forcibly removed for quarantine — that the tragedy quietly unfolded.