Inclusion Criteria:  Aged 18 or over Able to understand/read Chinese A HAM-D-17 score of ≥ 8 Able to provide written informed consent  Exclusion Criteria:  Clinical Diagnosis of Major Depressive Disorder (e.g., bipolar affective disorder or schizophrenia) Alcohol or substance dependence Concomitant unstable major medical conditions or major neurological conditions such as brain tumor, brain aneurysm Hemophilia or other blood clotting disorders or thrombosis Significant communicative impairments Participants with metal implant in brain or treated area of the head Participants who undertook corticosteroid treatment within the last six weeks before first TPS treatment Pregnant or breastfeeding women.