How to say overpriced for nothing (slang) in Korean
Korean: 창렬[ chang-ryeol ]

Meaning
창렬 is a slang word for something that feels overpriced and not worth the money. People use it when the price is high, but the amount, quality, or value is disappointing. It is very informal, so use it only in casual situations with friends.
Example sentences
오늘 산 핫도그 완전 창렬이야.
The hot dog I bought today is a total rip-off.
학교 앞 떡볶이는 좀 창렬이네.
The tteokbokki in front of the school is kind of overpriced.
이 영화관 팝콘 너무 창렬해.
This movie theater popcorn is way overpriced.
휴게소 김밥이 창렬이라서 안 샀어.
The kimbap at the rest stop was a rip-off, so I didn't buy it.
친구가 그 가게는 창렬이라고 했어.
My friend said that store is a rip-off.