Inclusion Criteria:  Have NSCLC that has been classified as stage IIB (primary tumor > 4 cm), IIIA, or IIIB (N2 only) per the 8th edition of TNM staging system of International Association for the Study of Lung Cancer (IASLC) and the American Joint Committee on Cancer (AJCC). Subjects with non-squamous NSCLC should undergo genetic testing to confirm the absence of epidermal growth factor receptor (EGFR) sensitizing mutations or anaplastic lymphoma kinase (ALK) rearrangements; Eligible for radical resection (R0 resection) at the thoracic surgeon's discretion, and the lung function meets the criteria for planned surgery; Have at least one measurable lesion per RECIST v1.1 criteria; Have a performance scale of 0 or 1 on the Eastern Cooperative Oncology Group Performance Status (ECOG PS)  Exclusion Criteria:  Have pathological evidence for small cell carcinoma, neuroendocrine carcinoma, sarcoma, lymphoepithelial rumen carcinoma, salivary gland tumor, or mesenchymal tumor from the biopsy. Have been previously exposed to immune-mediated therapies, including but not limited to LAG-3 antibody drugs, anti-cytotoxic T lymphocyte antigen-4 (CTLA-4), anti-PD-1, anti-PD-L1, and anti-PD-L2 antibodies.