[4] In 2010, Ji-hyun made her acting debut in the television series It's Okay, Daddy's Girl, playing a law student.

[5] In 2011, Ji-hyun was cast in MBC's weekend drama A Thousand Kisses, playing the younger sister of Ryu Jin.

[6] In February 2013, Ji-hyun was cast in the idol version of Love and War 2, a sitcom which creates reenactments of the problems and issues a couple may face in their marriage.

[7] In October, Ji-hyun was cast in her first lead role in the mobile drama Please Remember, Princess.

[14] On June 13, 2016, Cube Entertainment announced that 4Minute has disbanded and the members are still in discussion to renew their contracts.