One Day (South Korean band)

One Day
One Day
Origin	Seoul, South Korea
Genres	K-pop;
Years active	Undebuted
Labels	JYP;
Spinoffs	2PM; 2AM; JYP Nation;
Past members	Jun. K; Nichkhun; Taecyeon; Wooyoung; Junho; Chansung; Jaebeom; Jo Kwon; Lee Chang-min; Lim Seul-ong; Jeong Jin-woon;

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.