The participant will visit the clinical trial institution at 4, 8, 12, and 16 weeks after the application visit (Visit 2, Baseline) of the medical device for clinical trials. They will participate in the efficacy evaluation of the clinical trial medical device for a total of 16 weeks.

High Intensity Focues Ultrasound

- Evaluation of the efficacy

: Average change in AEH (Average Eyebrow Height) and MEH (Maximum Eyebrow Height) from the baseline, after the application of a medical device for clinical trials, as evaluated by an independent evaluator's eyebrow lifting photo evaluation at 4 weeks, 8 weeks, 12 weeks, and 16 weeks.

This result will be displayed as a percentage.

- Evaluation of the Exploratory

1. The proportion of participants who showed an improvement of 2 points or more in the Glabellar Line Scale (GLS) evaluation of the most frowning state at 4 weeks, 8 weeks, 12 weeks, and 16 weeks after the application of a medical device for clinical trials, compared to the baseline.
2. The proportion of participants who showed an improvement of 1 points or more in the Glabellar Line Scale (GLS) evaluation of the most frowning state at 4 weeks, 8 weeks, 12 weeks, and 16 weeks after the application of a medical device for clinical trials, compared to the baseline.

1. The frequency and percentage of Treatment-Emergent Adverse Events (TEAE), Adverse Device Effects (ADE), and Serious Adverse Events/Adverse Device Effects (Serious AE/ADE) that occurred after the application of the medical device for clinical trials are presented.
2. The frequency and percentage (%) of Treatment-Emergent Adverse Events (TEAE), Adverse Device Effects (ADE), and Serious Adverse Events/Adverse Device Effects (Serious AE/ADE) that occurred after the application of the medical device for clinical trials are presented.