Noun
back (side); reverse
ポールは会計報告の裏面操作について知識があったので、その隠れた才能を発揮して必要なものを全て手に入れていた。Paul's knowledge of creative bookkeeping has been the secret of his ability to get all the staffing he needs. the inside; background; dark side (e.g. of society); behind the scenes; beneath the surface
Also written 裡面【りめん】