If I Had Known Then What I Know Now (Korean title: 지금 알고 있는 걸 그때도 알았더라면) by Ryu Shiva has been read or recommended by 4 Korean celebrities, including RM (BTS), Kim Yoo-jung, Nam Joo-hyuk. Below, each entry shows where they mentioned it and what they said.
Pulled from the bag in a What's in My Bag video. A poetry book comes along because short reading breaks interrupt longer books, and Kim Yoo-jung strongly recommends it. (Source: Nate News)
Giselle was seen reading this between rehearsals in a concert behind-the-scenes video. (Source: Brunch)