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1.2.3.4 Back
From generasia

- Artist
- A'ST1
- Single
- 1.2.3.4 Back
- Released
- 2008.04.28
- Tracklist
- 1.2.3.4. Back
- Show
- Funky N Roll Tonight
- You
- Naega Baboyeosseo (내가 바보였어; I Was A Fool)
- Information
"1.2.3.4 Back" is A'ST1's debut single.