Inclusion Criteria:  Those who are fully informed of this study and then completely understand its contents, voluntarily decide to participate in this study, and give written consent to follow instructions Males or females aged 19 years or older at the time of written consent Those who have already experienced symptoms of overactive bladder (OAB)* for 6 months or more at the time of screening Those who are able to read, understand, and write in a voiding diary and a questionnaire Those who are able to go to the toilet on foot without other's help  Exclusion Criteria:  Those who have a history of malignancies within 3 years before screening Those who were previously or are currently diagnosed with urinary malignancies (e.g., bladder cancer) Males who were previously or are currently diagnosed with prostate cancer or whose prostate-specific antigen (PSA) level is ≥ 4ng/mL within 1 year before screening or at screening Those with a history of allergy to β-adrenergic receptor agonists, intolerant or clinically significant adverse events, or abnormal clinical laboratory values Pregnant or lactating women Those whose systolic blood pressure (SBP) is ≥160mmHg; diastolic blood pressure (DBP) is ≥100 mmHg; or pulse is ≥110 bpm at the time of screening and randomization Those who received other investigational products or investigational devices within 30 days before screening Those who are determined by the investigator to be not eligible for this study due to clinically significant abnormal findings of screening tests