Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 1.2 | 삐에로 | 4:12 | ISU | I Am... | ISU | Album |
| VITAMIN (Korean label & distributor) | |
| 1.2 | 삐에로 | 4:12 | 이수 | I AM... | 이수 | Album |
| VITAMIN (Korean label & distributor) | |
| 1.2 | 삐에로 | 4:12 | 이수 | BEST of BEST | 이수 | Single + Compilation |
| OGAM Entertainment | |
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