According to KBS on January 24, the song "Rewind" in Jonghyun's new album 'Poet｜Artist' is deemed unfit for broadcast. The reason is due to the usage of Japanese in its lyrics.
The problematic lines states, "いち に さん もう一回だけ(もう一回だけ", which translates to "One, two, three. One more time."
"Rewind" was initially revealed at the late Jonghyun's solo concert 'The Letter' in 2017.