Nam Ji-hyun (nascida em 17 de setembro de 1995) é uma atriz sul-coreana que passou com sucesso de uma das principais artistas infantis da indústria para uma protagonista aclamada, amada por seus papéis em Queen Seondeok, Shopping King Louis, Suspicious Partner, e 100 dias, meu príncipe.Nam começou sua carreira como atriz infantil e é mais conhecida por seus papéis em East of Eden (2008), Queen Seondeok (2009), Will It Snow for Christmas? (2009), Angel Eyes (2014) e O que acontece com minha família? (2014). Ela também apareceu na minissérie Girl Detective, Park Hae-sol, no drama adolescente To the Beautiful You e nos filmes A Reason to Live e Hwayi: A Monster Boy.Em 2016, ela encabeçou seu primeiro drama, a comédia romântica Shopaholic Louis da MBC, com Seo In-guk, onde impressionou os espectadores com sua atuação.Em 2017, ela estrelou o drama jurídico da SBS, Suspicious Partner, ao lado de Ji Chang-wook. O programa teve uma participação de audiência modesta, mas venceu seu concorrente ao liderar o importante grupo demográfico de 20 a 49 anos, bem como gráficos de streaming, popularidade e reputação de marca por semanas consecutivas. Em 2018, Nam estrelou ao lado de D.O do EXO no drama de romance histórico 100 Days My Prince. A série foi um sucesso comercial, tornando-se o quinto drama coreano de maior audiência na história da televisão a cabo. Em 2020, Nam estrelou o thriller de fantasia e mistério 365: Repeat the Year como um escritor perfeccionista de webtoon.

Cheon Seong-im (Hangul: 천성임; born August 15, 1981), better known by her stage name Song Ji-hyo (송지효), is a South Korean actress and model. She made her acting debut in Wishing Stairs (2003), one of Whispering Corridors film series. She then received further recognition for her roles in Princess Hours (2006), Jumong (2007), A Frozen Flower (2008), New World (2013), Emergency Couple (2014), and My Wife's Having an Affair this Week (2016).Song is also known for being one of the members of the South Korean variety show Running Man.

Kim You-jung (김유정) is a South Korean actress, born in Seoul, who studied at Goyang High School of Arts. She started out as a child model and after she made her acting debut at the age of 4 became one of the best-known child actresses in Korea. She was discovered at 5 years old in a contest that her older sister joined and won the Most Popular Award even though she was not one of the contestants. She is now transitioning into adult roles and is best known for Dong Yi, Moon Embracing the Sun, and May Queen. Kim is the youngest of 3 siblings. Her older sister Kim Yeon Jung is also an actress.She was considered "Korea's Little Sister" when she was a child actress. She has since been dubbed "Sageuk Fairy" after starring in several acclaimed historical period dramas in her career. In 2017, she ranked 8th on Forbes Korea Power Celebrity list, the youngest to be included in the Top 10 at 17 years old.In February 2018, it was revealed that Kim was diagnosed with dysfunctions of the thyroid gland and would take a break from acting.