Inclusion Criteria:  Inadequately controlled with triple OADs (metformin, glimepiride, dipeptidyl peptidase-4 inhibitor) showing HbA1c 7.5-12.0%  Exclusion Criteria:  Type 1 diabetes Gestional diabetes Diabetes due to secondary causes Receiving anticancer treatment Receiving glucocorticoids or immune-suppressants Have been treated with sodium glucose co-transporter 2 inhibitors for more than 7 consecutive days within 3 months before entering the study Have been treated with any type of insulin for more than 7 consecutive days within 3 months before entering the study