Serf is a dual monopolar radiofrequency (RF) lifting device that combines two frequencies in a single device, delivering energy to multiple layers from the dermis to the fat and fascia layers. Doctors Dermatology Jamsil Songpa uses genuine tips, and the procedure is performed with a wider tip area plus cooling and energy-distribution technology to reduce heat and pain during treatment. You can choose between the standard 600-shot option and a 600-shot option performed exclusively by the head director.