Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 1.3 | 편지 | 4:53 | 김종국 | 네번째 편지 | 김종국 | Album |
| 101Entertainment (K‐pop) | CMBC0632 |
| 1.18 | 편지 | 4:53 | 김종국 | 2008 연가 | Various Artists | Album + Compilation |
| Stone Music Entertainment | |
| 3.13 | 편지 | ?:?? | 김종국 | 2008 연가 | Various Artists | Album + Compilation |
| Stone Music Entertainment | |
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