Korean Air now runs seven lounges at Incheon Terminal 2, and they are not the same room twice. This one has a chef-made Noodle Bar, a build-your-own bibimbap counter and a staffed bar.
The Korean Air lounge at Narita Terminal 1 is a fraction of the size of the Incheon one, with very little food, but it is calm and spotless. What is actually there, and who can get in.
The Korean Air lounge at Incheon Terminal 2 has a wall of instant ramen and a machine that cooks it for you. Here is what the Ramyeon Library is actually like, and which lounge to walk to.