STAYC’s Sieun: Profile, Facts, Ex-Trainee of JYP, Etc.


Meet the Multi-Talented Idol and Actress with Stunning Visual—STAYC’s Sieun

It’s not a rare thing to see an idol who made a debut as an actor or actress. Then again, the agencies usually provide acting classes to their trainees so they can act well in front of the camera. If their performances are good, or if they want to challenge themselves, they can debut as an actor or actress. You can find some idol-turned-actors such as D.O from EXO, Jinyoung from GOT7, Cha Eunwoo from Astro, etc.

But it’s quite rare to see an actress turn into an idol.

Well, it’s not that it is impossible. Because the person that we’re going to talk about in this article made a debut as an actress first before turning into an idol. Who is that special person?

It’s Sieun from STAYC! She’s also known for her full name Park Si-eun when she debuted as an actress. After starring in several dramas, surprisingly, Sieun made a debut as an idol. Let’s check out some more info about Sieun from STAYC in the sections below!

STAYC’s Sieun’s Profile


Let’s see more info about Sieun in her profile below!

Full name: Park Sieun

Korean Stage Name: 시은

Korean Real Name: 박시은

Stage Name: Sieun

Nicknames: Park Sigeum, Ssinie, Princess Fluffy, Sing-Sing-ie, etc.

Birthplace: Seoul, South Korea

Nationality: Korean

Height: 158 cm

Weight: 44 kg

Foot size: 235 mm

Birthday: August 1st, 2001

Zodiac Sign: Leo

Chinese Zodiac: Snake

Position: Main vocalist


Occupation: Singer, idol, actress

Blood type: A


  • Father: Park Nam-jung (Korean singer, 1966)
  • Mother: Heo Eun-joo (1974)
  • Younger sister: Park Si-woo (2004)

Debut as an actress: 2014

Debut in STAYC: 2020

Agency: High-Up Entertainment

STAYC’s Sieun’s Facts

  • Sieun is a big fan of IU and Park Bo-geom.
  • Sieun’s favorite words are “ma-eum” which means heart in Korean, and “grace”.
  • Sieun’s favorite movies are Titanic, Catch Me if You Can, and Inception.
  • Sieun’s favorite colors are sea blue and purple.
  • Sieun’s favorite season is summer.
  • Sieun doesn’t like soda.
  • Sieun had been a trainee for 4 years. Not only she was a trainee, but she also studied in school and acted in some dramas.
  • Sieun is close with Yoon Chan-young, an actor who is of the same age as her. She also acted with him several times.
  • Sieun’s memorable character was when she portrayed Shin Chae-kyung in Queen for Seven Days.

STAYC’s Sieun’s Pre-Debut


We know that Sieun was a child actress before she made a debut in STAYC. She is also known to be the daughter of a popular Korean singer, Park Nam-jung. Knowing this fact, no one could predict that she will make a debut as an idol when she grows up. Not only that, but she was also a trainee of JYP Entertainment.

Well, instead of just getting confused by Sieun’s story before she made a debut in STAYC, let’s see the pre-debut story of Sieun below!

Sieun was born with the name Park Si-eun, just like how she was called when she starred in every K-drama that she was in. Sieun is the daughter of Park Jung-nam, the Korean singer who made a debut in 1988. Park Jung-nam and his wife got married in the year 1999. They had their first child, Sieun, who was born in 2001. Sieun lived in Yongsan-gu, Seoul, along with her parents and her younger sister who was born in 2004.

Having a beautiful face since she was a kid, Sieun has impressed people by showing her acting skills and cute face in some Korean movies or dramas. She made her debut as an actress in 2014 when she starred in Pride and Prejudice. She kept on going as she joined JYP Entertainment as an actress in their subsidiary company for the acting field, JYP Actor starting in 2017.


However, Sieun did not only sign a contract for JYP Actor, but she also became a trainee who will debut as an idol later. Sieun’s popularity as a trainee in JYP Entertainment has been going around the internet. Especially since she also starred in some dramas during that time, and made popular the name of JYP Actors. Since she was around 17 years old at that time, people predicted that she will be included in JYP Entertainment’s upcoming girl group.

And that’s why we saw Sieun’s name in some potential members of JYP Entertainment’s new girl group. Her age matched, her skills in singing are undoubtful, she is also perfect for the visual, not to mention her acting skills… people started to call her the second Bae Suzy, especially if Sieun actually joined ITZY, the upcoming girl group of JYP Entertainment. Just like Suzy who started her career as an idol in Miss A.


But turned out Sieun’s path to be an idol wasn’t in JYP Entertainment. First of all, ITZY made a debut in early 2019 without including Sieun in the line-up. There was a rumor going around that Sieun will be focusing on acting instead of becoming an idol. People also wondered if maybe Sieun will be debuting in the next girl group.


All these questions were answered when Sieun left JYP Entertainment and searched for a new agency, High-Up Entertainment. It is the agency that later debuted her as an idol. When she was auditioning for High-Up Entertainment, Sieun sang TWICE‘s song “Fancy”, and Kim Sejong‘s song “One in Ten Thousand”. Sieun officially became a trainee of High-Up Entertainment in August 2019.

STAYC’s Sieun’s Debut


Sieun’s journey to becoming an idol was filled with ups and downs. She almost debuted as an ITZY member, but it turned out that she was one of the JYP actresses, she even signed with other acting agencies such as BH Entertainment or KEY EAST Entertainment. But Sieun disproved all these speculations and turned down all the predictions by joining a K-pop agency called High-Up Entertainment. She really has a strong will to pursue her dream as a singer and it shows.

In October 2020, High-Up Entertainment announced that they will be debuting a new girl group soon called STAYC. The group has six beautiful and talented members, who are Sieun, Sumin, Seeun, J, Isa, and Yoon. The group’s name itself is an acronym for “Star to a Young Culture”, it’s also the title of the first single album of STAYC.

STAYC released their debut song and debuted officially on November 12th, 2020. The debut song is titled “So Bad”. Let’s see the music video of “So Bad” by STAYC!

And now it’s time to see the dance performance of STAYC with their debut song, “So Bad”!

Even though the title song is “So Bad”, the song is beyond good. What do you think about STAYC’s debut era? Let us know your opinion in the comment section!