I've been doing extensive research on slimming and body shaping. I would not recommend RF as I've tried it and the changes are too minimal. RF is better for firming.
Best non-invasive shaping and weight loss methods so far are Liposonix, Coolsculpting and Vasershape, as compare to older generation laser procedures which only melt lipid inside fat cells, these 3 ELIMINATES fat cells. All takes around 3 months for fat to melt and discharge from body. But I still haven't found a clinic in Seoul that do them. (Liposonix can have best results out of the 3 as it can 'elimate' most fat while Coolscultping suppose to eliminate 20% of the treated layer. But Coolsculpting is painless, that's why it's gaining popularity)
If you are up for minimal-invasive methods too, Laser/Ultrasound assist lipo is actually the best option in terms of results, safety and minimal scarring and pain. Personally think Smartlipo Triplex (newest generation), uses 1444nm laser to melt fat and lower degree laser to tighten your skin, is best option. Unfortunately I can't find any hospital in Seoul got that
(Please let me know if anyone know). 365MC, which is a specialist in weight loss, has Lipolysis Laser, which is similar to Smartlipo but doesn't have tightening effect. Prices are reasonable (around US$1500-1800 per part)
Alternative is Accusculpt which uses 1444nm laser to melt fat, but less tightening effect vs Smartlipo. BK and JW has Accusculpt (JW quoted around US$2500 per part)
Also note 365MC is promoting this new innovation LAMS(Local Anesthetic Minimal- invasive lipo-Suction), pushing No incision/ No Anesthesia, No Garment, No recovery time. From their description, sounds like mini lipo + dissollution. Personally am skeptical about just sticking a needle in to pull fat out, but it's relatively cheap. They quoted around US$1000 per part.
http://eng.365mc.co.kr/landing/Y14/D0623lams_eng.html
All of the above procedures are supposed to be one- off, so better for visitors. Hope this helps.