The structured facts identify Sangin (상인, born Lee Sang-in) as a Korean musician and the keyboardist of Double Decker, but the available material does not extend beyond that outline. No recording history, chart data, debut details, or substantive narrative about his career or the group are present in the sourced material, and the K-Pop!t coverage provided concerns unrelated figures.
A profile built on invention would violate sourcing standards, so what can be stated accurately is this: Sangin is a Korean artist who performs as the keyboardist of Double Decker. Further coverage will be added as verified material becomes available.
