An Irrevocable Promise (Korean title: 돌이킬 수 없는 약속; original title: 誓約) by Gaku Yakumaru (薬丸岳) has been read or recommended by 2 Korean celebrities, including Yeri (Red Velvet), Lee Young-jin. Below, each entry shows where they mentioned it and what they said.
Named as an intriguing novel. (Source: Ilneun Saram, Minumsa)