The website address changes frequently. We can't always check, so this may happen. Please understand. The address of the site seems to have changed to https://www.data.go.kr/, but fortunately, since we showed you in the lecture that there is such a site, there will be no problem in proceeding with the lecture. If there are any changes, please tell us in the Q&A section. We will update them frequently, so you will be able to see the reflected results quickly. We have also updated the relevant part you mentioned. Thank you.