- For other people known as 'Yoonseo', see Yoonseo.
Yoonseo (윤서) is a South Korean singer .She is a former member of the girl group 1PS.
Career[]
2014-2015: 1PS[]
On March 3, 2014 she debuted as a member of the girl group 1PS, with the digital single "The First Score". This was the groups only release as they presumably disbanded the next year due to inactivity.