RED VELVET - knock on wood slowed + reverb

TWICE 트와아스 5th world Tour Ready To Be
Seoul KSPO Dome TWICE Chaeyoung Solo Stage

Chaeyoung - My Guitar  ( unreleased )

from Hyerin's reveal teaser (tripleS 트리플에스: JeongHyeRin.SSS). I haven't been able to find it anywhere else without Hyerin's voiceover.