MRCH

MRCH was a contestant on Mnet's mystery music game show "I Can See Your Voice 5" in episode 3 on February 16, 2018. She had the nickname "Yonsei University's BoA". She performed "Atlantis Princess" by BoA and "Energetic" by Wanna One. The guest artist of the episode was Wanna One.

MRCH used the name Joy when she was a member of the Yonsei University student YouTube channel YonkoTV in 2017 and 2018.

MRCH used the stage name Sina for a few months in 2017 and 2018 before she officially debuted.

MRCH wanted a stage name that was easy to explain. So, she decided to choose "MRCH" since she was born in March. The Hangul version of her stage name also includes her last name "Yoon".

MRCH performed on Arirang TV's "I'm Live" during episode 313 in 2023 and episode 340 in 2024.