Question: Which author wrote the story on which the movie in which Ko Chang-seok played the movie director was based?

Context articles: Rough Cut (2008 film)
Myōjin Yahiko
The Con Artists (2014 film)
Roverandom
Ko Chang-seok
Good Doctor (TV series)
Adam Tsuei
Crazy Boy (film)
Miracles from Heaven
Tabloid Truth

Rough Cut (; lit.
 "A Movie is a Movie") is a 2008 South Korean action crime film.
 It is the debut feature of director Jang Hoon and based on an original story by Kim Ki-duk.
 The film had a total of 1,307,688 admissions nationwide.
Myōjin Yahiko (明神 弥彦 ) , known as Yahiko Myojin in the Media Blasters English-language dub and Yoshi Myojin in the English Sony "Samurai X" dub, is a fictional character from the "Rurouni Kenshin" manga and anime series authored by Nobuhiro Watsuki.
 The character of Yahiko is based on the author's childhood experiences practicing kendo; since Watsuki's experienced frustration during kendo classes, the author wrote Yahiko as experiencing frustration with his kendo skills.
 Watsuki liked Yahiko, and while writing the manga, he began to develop the character so that readers would enjoy him.
The Con Artists (; lit.
 "The Technicians") is a 2014 South Korean heist film directed by Kim Hong-sun, and starring Kim Woo-bin, Lee Hyun-woo, and Ko Chang-seok.
Roverandom is a novella by J.R.R. Tolkien, originally told in 1925, about the adventures of a young dog, Rover.
 In the story, an irritable wizard turns Rover into a toy, and Rover goes to the moon and under the sea in order to find the wizard again to turn him back into a normal-sized dog.
 The author wrote "Roverandom" for his son Michael to amuse him upon the loss of his favorite toy, a little leaden dog which he lost on a beach of grey shingle stones the same size and colour as the toy.
 The work is in tone a children's story, but contains many allusions and references in the manner of "Farmer Giles of Ham".
 "Roverandom" was included in the collection "Tales from the Perilous Realm" from its 2009 reprinting onwards.
Ko Chang-seok (born October 13, 1970) is a South Korean actor.
 Ko began his career on stage, performing in plays and musicals for many years before moving on to bit parts in films.
 He once earned his living by working on farms and in iron foundries, then acquired fame through his scene-stealing roles in Jang Hoon's films, notably as the movie director in "Rough Cut" (2008), and the Vietnamese gang boss in "Secret Reunion" (2010).
 He has since become one of the busiest supporting actors in Korean cinema.
Good Doctor () is a 2013 South Korean medical drama television series starring Joo Won, Moon Chae-won, Joo Sang-wook, Kim Min-seo, Chun Ho-jin, Kwak Do-won and Ko Chang-seok.
 It aired on KBS2 from August 5 to October 8, 2013, on Mondays and Tuesdays at 21:55 for 20 episodes.
Adam Tsuei (; born October 26, 1959) is an entrepreneur, film producer, and director.
 He was the former president of Sony Music Entertainment in the Greater China Region.
 He has made and brought to the music world super idols as Jay Chou, Leehom Wang, F4 and Jolin Tsai, which made him been viewed as one of the most powerful masters behind the scene in entertainment industry.
 In 2011, he successfully marketed the film "You Are the Apple of My Eye", a movie featuring a love story within a group of boys and a girl, which made a great hit among all Chinese-speaking countries.
 Decided to dedicating to movie industry, Tsuei founded Amazing Film Studio in 2012 and served as CEO.
 In 2013, by putting effort into producing, marketing and distributing, he presented the film" Tiny Times" and "Tiny Times 2".
 Both of them quickly becomes the hottest topics among mainland China, Taiwan and Hong Kong.
 In 2014, with the same legend combination of Angie Chai and Giddens Ko, he presented" Café.
 Waiting.
 Love", a romantic comedy with color of fantasy inside.
 In the future of 2016, as a director and producer, Tsuei is going to present the film “The Tenants Downstairs”, adapted by Giddens Ko’s original novel.
 There will be a film with black humor, fantasy, mystery and thriller in.
 With the experience of being a professional manager in global enterprise for decades, Tsuei is aimed for building a total entertainment company for Greater China, including movie’s production, movie’s promotion, VFX, artist agency, music production and concert production.
Crazy Boy is a romantic teenage love story and family entertainer Kannada language movie produced in the 2016.
 The movie stars Dilip Prakash in lead role and Ashika, making her debut as the female lead in the film.
 Directed by Kannada movie director Mahesh Babu the movie released on 18 August 2016.
Miracles from Heaven: A Little Girl, Her Journey to Heaven, and Her Amazing Story of Healing is a memoir written by an American author Christy Beam, released on April 14, 2015.
 The author wrote the book about her own sick daughter Annabel Beam.
Tabloid Truth (; lit.
 "Leaflet: Dangerous Rumors") is a 2014 South Korean thriller film directed by Kim Kwang-sik, and starring Kim Kang-woo, Jung Jin-young, Ko Chang-seok and Park Sung-woong.