This was our first time purchasing from Klook. The checkout process was very smooth. The ticket sold on Klook is cheaper than in person or through a local travel agent. However, Klook only offers one type of all-day pass, unlike others. We were also able to use the unused, pre-purchased ticket from the previous day the next day. Entry was simple—you just scan the PDF barcode received via email, no need to visit the customer service window. If you parked your vehicle, you can use the same barcode at the Auto Fee Kiosk after entering your license plate number to get a discount, reducing the parking fee to 3,000 KRW. Use a T-Money card, Korean bank card, or Wow Pass card to pay for the auto fee, as Visa cards can be unreliable. The food inside is average, drinks are reasonably priced, and they accept Visa inside. We visited on a Wednesday, so there were no lines. Thanks, Klook!