| Year | Review Target | Credit Ratings | Credit Rating Agency |
|---|---|---|---|
| 2025(Present) | Corporate Bond | AA | Korea Ratings |
| Corporate Bond | AA | Korea Investors Service | |
| Corporate Bond | AA | Nice Investors Service | |
| 2023 | Corporate Bond | AA | Korea Ratings |
| Corporate Bond | AA | Korea Investors Service | |
| Corporate Bond | AA | Nice Investors Service | |
| 2022 | Corporate Bond | AA | Korea Ratings |
| Corporate Bond | AA | Korea Investors Service | |
| Corporate Bond | AA | Nice Investors Service | |
| 2021 | Corporate Bond | AA | Korea Ratings |
| Corporate Bond | AA | Korea Investors Service | |
| Corporate Bond | AA | Nice Investors Service | |
| 2020 | Corporate Bond | AA+ | Korea Ratings |
| Corporate Bond | AA+ | Korea Investors Service | |
| Corporate Bond | AA+ | Nice Investors Service | |
| 2019 | Corporate Bond | AA+ | Korea Ratings |
| Corporate Bond | AA+ | Korea Investors Service | |
| Corporate Bond | AA+ | Nice Investors Service | |
| 2018 | Corporate Bond | AA+ | Korea Ratings |
| Corporate Bond | AA+ | Korea Investors Service | |
| Corporate Bond | AA+ | Nice Investors Service | |
| 2017 | Corporate Bond | AA+ | Korea Ratings |
| Corporate Bond | AA+ | Korea Investors Service | |
| 2016 | Corporate Bond | AA+ | Korea Ratings |
| Corporate Bond | AA+ | Korea Investors Service | |
| 2015 | Corporate Bond | AA+ | Korea Ratings |
| Corporate Bond | AA+ | Korea Investors Service |
| Year | Moody's | S&P |
|---|---|---|
| 2025(Present) | Ba1(Negative) | BBB-(Negative) |
| 2024 | Baa3(Negative) | BBB-(Negative) |
| 2023 | Baa3(Stable) | BBB-(Negative) |
| 2022 | Baa3(Negative) | BBB-(Negative) |
| 2021 | Baa3(Negative) | BBB-(Negative) |
| 2020 | Baa2 (Negative) | BBB (Negative) |
| 2019 | Baa1 (Negative) | BBB (Stable) |
| 2018 | Baa1 (Stable) | BBB+ (Stable) |
| 2017 | Baa1 (Stable) | BBB+ (Stable) |
| 2016 | Baa2 (Positive) | BBB (Stable) |
| 2015 | Baa2 (Stable) | BBB (Stable) |
| 2014 | Baa3 (Stable) | BBB (Negative) |