To investigate the safety profile and tolerability of SOB100, a targeted exosome drug delivery platform derived from HEK293T cells engineered with an anti-Human Leukocyte Antigen G(HLA-G) nanobody. An open-label, dose-escalation Phase I with a total of fifteen subjects will be enrolled in five cohorts, three subjects in each cohort, comprising one single-ascending dose (SAD) cohort or multiple-ascending dose (MAD) cohorts (low, medium, and high dose levels). This will be the first in-human study to evaluate the safety and tolerability of HLA-G targeted exosome (SOB100) in healthy volunteers.Trial registration number: NCT07219940 (ClinicalTrials.gov).