I received it about 8 times, and I don't know if it's because I received it intermittently, but it's definitely not semi-permanent!! And it was really itchy until the second time I received itㅠㅠ But after I did it, it was really comfortable and my quality of life improved. I think the average cost is 70,000 won per session, and it's convenient to buy a session ticket or when there's a discount.