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One Day | |
|---|---|
| Origin | Seoul, South Korea |
| Genres | |
| Years active | Undebuted |
| Labels | |
| Spinoffs | |
| Past members | |
One Day was an eleven-member South Korean band. It was started by Korean musician Park Jin-young. After performing as one group, it was splintered into two separate bands called 2AM and 2PM respectively.