(끈질긴 기쁨)is a December 1, 2013 TV series directed by Kim Jong-Yeon(KBS2 Episodes 1) South Korea.
Sun-Joo ( Ryoo Hyoun-Kyoung ) wants to go to Mt. Jiri with her boyfriend Kyoung-Woon ( Heo Jeong-Min ), but because of Kyoung-Woon she can't go. Sun-Joo is disappointed and drinks alcohol. At that time, she happens to meet writer Joon-Ki ( Jung Eun-Woo ). Sun-Joo is attracted to Joon-Ki. They kiss on the first day they meet. After the kiss, Joon-Ki suggests that they go see the morning sea together. Sun-Joo accepts, but when gets to the car she finds Joon-Ki's friend Dong-Soo ( Lee Joo-Seung ) in the car.
As the sun rises, Joon-Ki acts strange. Sun-Joo becomes frightened by his weird behavior and Dong-Soo also makes her uncomfortable. Sun-Joo wants to go back to Seoul, but they go to see Joon-Ki's friend in Gangneung.
To get away from them, Sun-Joo contacts her friend Myoung-Hee ( Song Min-Ji ) who lives also in Gangneung. Sun-Joo finally gets to Myoung-Hee’s house, but Sun-Joo doesn't know there is a monster more strange than anyone else in Myoung-Hee's home.