Hada revealed that he was very happy when the offer to dramatise his award-winning novel came along especially since this book was the breakthrough work in his career. However, he "complained" that his new novel "Contest of the Dead" wasn't doing that well in terms of sales despite a fair bit of promotion done so Hada called upon the viewers to start reading his works by buying the novel of "Scrap and Build" after watching this drama SP. Hada commented that he has this thinking that once he finishes a book, it is as if the book will leave his hands so he's not resistant to the idea of having his novels being dramatised. Especially since he felt that NHK produced high quality dramas, Hada accepted the offer quickly.
Emoto said that although there are various things happening to his character in the drama, he doesn't think that Kento is a special person so he tried not to make Kento appear too out of the ordinary during the filming.
Sources: Eiga.com / Oricon