Does anyone know anything about Naver & Curly Market membership discount pricing?

If you download the coupon and receive a 20% discount from Membership Curly & Mart, you can purchase it according to the price in red checked below, but when you put it in the shopping cart, the price is in the black price above instead of the red price below. What is the right price?

I’ve put Coupang away and am using Naver, but every time I use it, I can’t tell exactly what the right price is. Even if I apply the coupon, the red price doesn’t apply, so it’s won.