Seo-jin is a widower still grieving his wife's death. Then he receives the news that his long-lost younger sister, Yoo-jin, who went missing 25 years ago, has turned up. Unlike the rest of his family, who welcome her into their arms, Seo-jin feels that Yoo-jin is a stranger.
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.