Birth Name: Park So Eun (박소은)
Position: Main Dancer, Lead Vocalist, Center
Representative Day of the Week: Thursday
Representative Planet: Jupiter
Representative Color: Light Blue
Soeun was born Park So Eun (박소은) on October 26, 2002 in Gwangju, South Korea. She graduated from Seoul Cheongdam High School.
In October 2017, she became a contestant on the survival show MIXNINE. She was eliminated in the seventh episode with an overall rank of 55th.
In October 2018, she was revealed as the fifth member of Favegirls, the pre-debut group that would eventually become Weeekly.
On May 11, 2020, her profile photo for Weeekly was revealed. She officially debuted as a member of the group with on June 30 with the mini album We Are.