How Philosophy Becomes a Weapon in Life (Korean title: 철학은 어떻게 삶의 무기가 되는가; original title: 武器になる哲学 人生を生き抜くための哲学) by Shū Yamaguchi (山口周) has been read or recommended by 2 Korean celebrities, including Ahn Hyo-seop, Chang Kiha. Below, each entry shows where they mentioned it and what they said.
The book that got Ahn Hyo-seop into philosophy: a bit challenging, but told in a fun, accessible way. (Source: GQ Korea)