Han Ga-in (born Kim Hyun-joo on February 25, 1982) is a South Korean actress.
 She starred in television series "Yellow Handkerchief" and "Terms of Endearment" early in her career, and became a sought-after model in commercials.
 Her projects in 2012 were hugely successful, with her period drama "Moon Embracing the Sun" topping the TV ratings chart, and her film "Architecture 101" becoming a box office hit.
Dr. Kkang () is a 2006 South Korean television series starring Yang Dong-geun, Han Ga-in and Lee Jong-hyuk.
 It aired on MBC from April 5 to May 25, 2006 on Wednesdays and Thursdays at 21:55 for 16 episodes.
Kim Ju-hyeon (born March 10, 1987) is a South Korean actress.
 Kim debuted in the film "Epitaph" in 2007.
 She is known for resembling Han Ga-in.
Architecture 101 (; lit.
 Introduction to Architecture) is a 2012 South Korean romance film written and directed by Lee Yong-ju.
 The film tells the story of two students who meet in an introductory architecture class and fall in love.
 Fifteen years later, the girl tracks down her first love to seek his help in building her dream house.
Sweet Sixteen (, literally combining the names of the main characters) is a 2016 Chinese-South Korean romance film directed by Jo Jin-kyu and starring Kris Wu, Han Geng, Joo Won and Lu Shan.
 It was released in China by Heng Ye Film Distribution on August 5, 2016.
The Contact () is a 1997 South Korean romance film directed by Chang Yoon-hyun.
 Starring Han Suk-kyu and Jeon Do-yeon, it was the second biggest-grossing Korean film of 1997 with 674,933 admissions, and was awarded the Grand Bell Awards for best picture.
Super Rookie (; lit.
 "New Employee") is a 2005 South Korean television series starring Eric Mun, Han Ga-in, Oh Ji-ho, and Lee So-yeon.
 It aired on MBC from March 23 to May 26, 2005 on Wednesdays and Thursdays at 21:55 for 20 episodes.
 The workplace comedy is a satire on Korea's corporate culture and unemployment among the country's younger generation.
 It scored solid viewership ratings in the 20% range.
Bad Guy () is a 2010 South Korean melodrama television series, starring Kim Nam-gil, Han Ga-in, Kim Jae-wook, Oh Yeon-soo and Jung So-min.
 Directed by Lee Hyung-min, it aired on SBS from May 26 to August 5, 2010 on Wednesdays and Thursdays at 21:55 for 17 episodes.
Living Death (Korean: 불신지옥 lit.
 "Distrust Hell", also known as Possessed) is a 2009 South Korean horror film written and directed by Lee Yong-ju.
 The film received 248,503 admissions in South Korea.
Lee Yong-ju (born June 6, 1970) is a South Korean film director and screenwriter.

Question: Which Korean romance film written and directed by Lee Yong-ju was Han Ga-in in?
Answer: Architecture 101