Sumin is the younger of two daughters in her family. Sumin's older sister was born on August 16, 1998. Her family keeps three pet cats at home.
Debut with STAYC September-November 2020
Sumin was revealed as STAYC's second member on September 9, 2020. On October 15, her prologue film was released. The trio made their debut with their first single album "Star To A Young Culture" on November 12.
Leader Position: November 2020-April 2023
On April 1, 2023, STAYC members stated through Weverse Live that the group would implement a new rotational leadership system, with a different member(s) serving as leader(s) for each comeback.
Sumin Facts- Sumin was born in Pohang, South Korea
- BTS is her role model.
- She has difficulty pronouncing the Korean character "Siot" (ㅅ).
- Sumin is STAYC's oldest member.
- 'Water' is her group item.
- Her dorm roommate's name is Yoon.
- She was once a Plan A Entertainment trainee.
- Sumin appeared in Huh Gak's The Last Night music video.
Sumin has been training for 5 years and 6 months.
- She was born and raised in the South Korean city of Pohang, North Gyeongsang.
- Her monikers are BaeSum and Sum.
- Sumin used to train with the WEEEKLY members.
- She has a sibling who is older than her.
- Her talents include cooking seaweed soup and performing an eyebrow wave.
- Dancing to GFRIEND's "Rough" showed her agency that she was a skilled dancer.
- A rabbit is Sumin's designated spirit animal.
- She tried out for Produce 48 but did not make the cut.
- Her mantra is "Look at the forest, not the trees."
Sumin enjoys polaroid photography, eating corn, and watching webtoons.
- She was revealed to be STAYC's second member.
- Sumin wishes to make friends with members of KARD and Girls' Generation.
- She and Sieun are the same height.
- Sumin spends her free time with Yoon playing video games.
- In 2018, she signed High Up Entertainment.