You are correct mostly. Food, street eating, Korea is the most expensive, then Japan, China is the cheapest. This is multi level comparison, Korea almost does not have extremely cheap eat( $14000 won/¥100 RMB minimum) where In Japan and China, ¥40-¥80most cheap eats can easily be found. Also if you can not take any spicy food, you will be very difficult to find any dish without spicy.