Lee So-yul (; born Im Yu-jin, November 22, 1990), better known by the stage name Lee Yu-bi () is a South Korean actress.
Lee and her younger sister Lee Da-in are the daughters of the actors Kyeon Mi-ri and Im Young-gyu, who divorced in 1993. When Kyeon remarried in 1998 to Lee Hong-heon, he legally adopted his stepdaughters and gave them his surname. Yu-bi changed her real name, Lee Yu-jin, to Lee So-yul, but she did not change her stage name.
She began her career in the 2011 sitcom Vampire Idol, then played supporting roles in television dramas The Innocent Man (2012), Gu Family Book (2013), and Pinocchio (2014), as well as the films The Royal Tailor (2014) and Twenty (2015). Lee plays her first leading role in Scholar Who Walks the Night, adapted from the webtoon about a Joseon vampire scholar and a cross-dressing bookseller.
In 2017, Lee starred alongside Choi Min-ho in the JTBC web drama Somehow 18. In October 2017, Lee signed with new management agency 935 Entertainment.
In 2018, Lee starred in the medical slice-of-life drama, A Poem a Day.
In July 2023, Lee left 935 Entertainment and signed with new agency Ghost Studio.