The subjects, having voluntarily agreed to participate in the clinical trial and provided informed consent, will undergo screening tests. During Visit 1 (Screening), subjects meeting the inclusion/exclusion criteria will go through an 8-week stabilization period.

At Visit 1-1, central laboratory tests will be conducted. If the test results meet the criteria for Visit 2 (Enrollment Visit), the subject will be eligible to participate in the clinical trial.

The subjects will receive the investigational drug (DWP16001 0.3 mg) once a day for 52 weeks. They will visit the clinical trial site at weeks 8, 16, 24, 38, and 52 for safety and efficacy assessments during the 52-week treatment period.

The subjects, having voluntarily agreed to participate in the clinical trial and provided informed consent, will undergo screening tests. During Visit 1 (Screening), subjects meeting the inclusion/exclusion criteria will go through an 8-week stabilization period. Throughout this period, subjects will receive concurrent administration of metformin (≥1,000 mg/day) and gemigliptin (50 mg/day), and will have a washout period for other oral antidiabetic drugs.

At Visit 1-1, central laboratory tests will be conducted. If the test results meet the criteria for Visit 2 (Enrollment Visit), the subject will be eligible to participate in the clinical trial.

The subjects will receive the investigational drug (DWP16001 0.3 mg) once a day for 52 weeks. They will visit the clinical trial site at weeks 8, 16, 24, 38, and 52 for safety and efficacy assessments during the 52-week treatment period.

Inclusion Criteria:

1. Subjects with T2DM age 19 ~ under 80 years
2. Subjects who have 7% ≤ HbA1c ≤ 11% in screening visit(V1-1)
3. Subjects who have FPG <270 mg/dl screening visit(V1-1)
4. Subjects who have received a combination of metformin (≥1,000 mg/day) and gemigliptin (50 mg/day) for a minimum of 8 weeks prior to Visit 2 (Enrollment Visit)
5. Subjects who voluntarily decided to participate and provided written consent after being told of the objectives, method, and effects of this study

Exclusion Criteria:

1. Subjects with current or history of hypersensitivity to the IP of this study, metformin or drugs of the same class and their components (e.g., history of hypersensitivity to biguanide or SGLT2 inhibitors)
2. Diabetic ketoacidosis, diabetic coma or precoma within the past year
3. Urinary tract infections or genital infections within
4. Uncontrolled hypertension (SBP > 180 mmHg or DBP > 110 mmHg)
5. eGFR < 45 mL/min/1.73 m2
6. Severe heart failure (NYHA class III/IV