A famous writer named Kim Taeyeon who published her last book. The book is about her biggest secret, hidden feelings and untold words she kept for over 10 years. Secretly, it's about her first love but she used other character's names to hide her true intentions.

For me, this is very wrong.

I just want to forget her badly.

I just want to expressed my all emotions that I kept.

What if she reads the book for her? Or about her?

Will she notice it? Will she notice my heart?

What if my friends notice that this is all about me?

How can I face the past when I have the present and future already?

How can you face me when you also have already?

Is this book was good for me or not?

"Do you know who you really are in my book?" Taeyeon asked her.

Can you all identify them in my book?

Characters:

In Reality:

Kim Taeyeon, an author of the "TWFY", main character

Jessica Jung (unknown)

Tiffany Hwang (unknown)

Kwon Yuri, her personal assistant, childhood friend.

Seo Joohyun (unknown)

Im Yoona (unknown)

Choi Sooyoung (unknown)

In Book (Fiction Characters)

Kang Seulgi, a shy and quiet girl who had never fall in love anyone else.

Wendy Son, a complete opposite version of Kang Seulgi. Kang Seulgi's bestest friend 

Irene Bae, famous girl crush in university. Wendy Son's childhood friend.

Joy, mysterious girl who notice about Seulgi's secret.

Yeri, a dongsaeng/neighbor who has a longtime crush to Kang Seulgi.

Other characters:

Twice (Nayeon, Tzuyu & Chaeyoung as Yeri's friends)+ cameos of others members.

f(x) ( Krystal as unknown)

Exo (Sehun and Kai as Seulgi's friends) ( 2 Exo's member n/a)

SuperJunior (Kyuhyun as cameo and Donghae as unknown)

NCT (Taeyong as Seulgi's friend)

Might other idols mentioned.