Hepatitis B Ulsan Northern Public Health Center

I got the 1st and 2nd doses of the vaccine and the 3rd dose today, the last one, because I was told I didn't have hepatitis B antibodies during my health checkup. I asked the local hospital about the price and it was 30,000 won, but the public health center was much cheaper at 7,000 won. I think I'll be done after a blood test in a month to see if I have hepatitis B antibodies.