I can tell you that 'Asian Drama' isn't a single book but often refers to adaptations from novels or manga. For instance, 'Boys Over Flowers' was originally a manga by Yoko Kamio, later adapted into multiple drama versions. Similarly, 'The Untamed' is based on the novel 'Mo Dao Zu Shi' by Mo Xiang Tong Xiu. Many Korean dramas like 'Crash Landing on You' are scripted by original writers, such as Park Ji-eun, while others like 'Itaewon Class' stem from webtoons by Gwang Jin.
Japanese dramas frequently adapt light novels, like 'Rascal Does Not Dream of Bunny Girl Senpai,' written by Hajime Kamoshida. Taiwanese dramas such as 'Meteor Garden' trace back to Japanese manga. The blend of novelists, manga artists, and screenwriters creates this rich tapestry. If you're curious about a specific drama, I can pinpoint its origin—just drop the title!