The first time was in Gangnam at ㅌㅅㅇㅍ
The second time I got it in Gangnam at ㅁㅈ and ㅁㅈ said the muscle mass on both sides was different, so they adjusted the injection amount differently. Personally, I think ㅁㅈ had fewer people and felt cleaner too.
The effect was similar for both, but ㅌㅅㅇㅍ was better.