Is South Korea very cheap?

Excuse me, I'm planning a trip to South Korea and I'm trying to budget. I've heard that South Korea is a very popular destination for tourists, but I'm also wondering if it's a cost-effective choice. Is South Korea generally considered to be an affordable destination? In terms of accommodation, food, and entertainment, how much does it typically cost to travel there? Are there any specific areas or activities that are significantly cheaper or more expensive than others? Any advice on how to keep costs down while still enjoying a great trip in South Korea would be much appreciated. Thank you!