
Ko Sung-hee (Hangul: 고성희; born June 21, 1990) is a South Korean actress. She is best known for her leading roles in Diary of a Night Watchman (2014) and My Holo Love (2020). She has also starred in While You Were Sleeping (2017) and Mother (2018).
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The series is about the office workers of Marketing Team 3 at the home appliance headquarters of Gaus Electronics—a multinational company. It highlights the highs and lows of corporate life, and love and friendship between the employees.

Unexpected love finds a lonely woman when she forms a connection with a humanlike hologram who looks exactly like his prickly creator.

In the late 19th century, the Joseon Dynasty is in peril because the Kim Family abuses power. The king's power has already weakened, and the people are suffering famine and hardship. Choi Chon-joong is Joseon's best fortune teller and physiognomist, who lost people he loves to Kim Family. He swore to overthrow the Kims and reform the country. He read the hunger to power in Lee Ha-eung, a humble-looking member of the royal family, and decides to help him to set his son on the throne. Meanwhile, the Kims also find the heir to the throne, using Bong-ryun's special gift. Bong-ryun, the daughter of the current king, has the power of psychometry. While the royals and powerful politicians are making and breaking alliances to get ahold of the thrones, Chon-joong focuses on kingmaking that can bring Chosun a new era.

A young girl named Hye-Na is abused by her mother, Ja-Young. Although she is not okay, she tells other people she is alright. Soo-Jin is a temporary teacher at the elementary school where Hye-Na attends. Soo-Jin is aware of her situation and decides to become her mother.

Choi Kyung Seo is a legendary lawyer at the top law firm in South Korea. He has charisma and an attractive appearance. He hires Go Yeon Woo as a rookie lawyer for the law firm. Go Yeon Woo has excellent memory.

Ms. Ma is sent to jail after being accused of killing her daughter. She escapes in order to find the real murderer and starts solving other cases.

Nam Hong Ju, endowed with the ability to foresee events, resides with her widowed mother who runs a small restaurant. Despite her gift, she often finds herself powerless to change the outcomes. On the other side of the street, Jung Jae Chan, a rookie prosecutor, and his younger brother Seung Won become their new neighbors. An unusual dream involving Hong Ju, ruthless attorney Lee Yu Beom, and a life-saving intervention leads Jae Chan to realize their destinies are intertwined, as they begin sharing dreams and connecting in mysterious ways.

Master Key is an interactive variety show where celebrities compete with one another and play various games in order to achieve victory each week. The players have to find those who have the two Master Keys, reasoning through an intense psychological warfare. The viewers become "Watchers" and participate in the game as well. By the number of votes, each star receives special abilities. Who will be chosen by the Watchers and become the final winner?

celebrities create bonds with strangers through conversations on the phone. The celebrities create friendships with the strangers by revealing their inner secrets, dreams and worries.

The fictional story begins after the execution of real-life North Korean general Jang Sung-taek. One day an order comes down from North Korea, reactivating erstwhile spy Park Hye-rim who has spent decades in South Korea as an ordinary housewife. She is given the mission to turn and bring in her own son, Kim Seonu. Cool-headed, quick-witted genius Seonu is an information analyst on North Korea working for the NIS. His girlfriend Yoon-jin is a tour guide for Chinese tourists who cannot speak Chinese, and they fell in love when Seonu helped her translate. Hye-rim is suddenly forced to choose between her son and country, and risks her life to see the choice through.
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