Is it cheaper to live in Japan or Korea?

Excuse me, I'm considering relocating to either Japan or Korea and am trying to decide which country would be more financially feasible for me. Could you possibly offer some insights into the cost of living in both places? I'm particularly interested in knowing about the average rent, cost of groceries, public transportation fares, and any other significant expenses that I should be aware of. I understand that prices can vary depending on the city or region, so a general overview would be greatly appreciated. Thank you for your time and assistance.