Lee Suji is an idol and actress. She played herself and her deceased sister Suah on THE iDOLM@STER.KR. She is a member of Real Girls Project. She is formerly a member of the now disbanded group The Ark.
Suji made her debut in the entertainment industry in 2015 with girl group The Ark under Music K Entertainment alone with Jane. They only produced one digital single "Somebody 4 Life". The Ark was confirmed to have disbanded in 2016.
Suji is confirmed to be a contestant on idol rebooting program "The Unit" on KBS along with Haseo and Jane. She can be seen close up on two occasions in the MV for The Unit's theme song "My Turn" (마이턴). She is also chosen as the center for the The Unit's 2nd MV.