Romance Is a Bonus Book

Romance is a Bonus Book (Korean: 로맨스는 별책부록; RR: Romaenseuneun Byeolchaekburok) is a 2019 South Korean television series starring Lee Na-young and Lee Jong-suk. It aired from January 26 to March 17, 2019 on tvN & Netflix (internationally).

Summary
Cha Eun Ho is a successful author and a senior editor at a book publishing company. Kang Dan-i is a mother and former successful advertising copywriter. When Cha Eun Ho was a child, Kang Dan-i saved him from an accident and was injured. Cha Eun Ho helped her recuperate and they have been close friends ever since. When Kang Dan-i goes through a major life change and tries to re-enter the professional world, their lives become even more connected. They face personal and professional challenges as they slowly start to realize their true feelings for each other.

Main

 * Lee Na-young as Kang Dan-i
 * Lee Jong-suk as Cha Eun-ho
 * Jung Yoo-jin as Song Hae-rin
 * Wi Ha-joon as Ji Seo-joon

Supporting

 * Kim Tae-woo as CEO Kim Jae-min
 * Kim Yoo-mi as Go Yoo-sun
 * Jo Han-chul as Bong Ji-hong
 * Kim Sun-young as Seo Young-ah
 * Kang Ki-doong [pronounced: ko] as Park Hoon
 * Park Gyu-young as Oh Ji-yool
 * Lee Kwan-hoon as Lee Seung-jin
 * Choi Seung-yoon as Bae Kwang-soo
 * Lee Ha-eun as Chae Song-ee
 * Oh Eui Sik as Hong Dong-min
 * Lee Ji Won as Hong Jae-hee
 * Hwang Se On as Kim Na-kyung
 * Noh Jong-hyun as Oh Ji-yool's ex-boyfriend

Guests

 * Oh Ui Shik as Hong Dong Min (Dan Yi's ex-husband; cameo)
 * Lee Ji Won as Hong Jae Hee
 * Shin Hye Jung as Eun Ho's girlfriend (cameo; Episode 1))
 * Cha Soon Bae as drunken man (cameo; Episode 1))
 * Noh Jong Hyun as Ji Yool's boyfriend (cameo; Episode 4)
 * Jannabi (잔나비) as themselves (cameo; Episode 5)

Spoilers/Notes

 * It is one of the highest rated Korean dramas in cable television history.
 * The early English title for this drama was originally going to be How To Publish Love & Romance Is a Supplement.
 * The first script reading was held on October 26, 2018 with the attendance of the cast and crew.
 * This series marks Lee Na-young's return to small screen after nine years and Lee Jong-suk's first romantic comedy
 * On January 21, 2019, a press conference was held to promote the series with the attendance of the lead cast.
 * Lee Jong-suk finished filming his scenes for the series on February 27, 2019 due to his military service enlistment on March 8.