A guide system for guiding a movably-supported first furniture part, in particular a first door wing of a folding door, hingedly connected to at least one second furniture part, in particular a second door wing of a folding door, comprising: - a first guide rail for guiding the furniture parts (3a, 3b), - a second guide rail for guiding the furniture parts (3a, 3b), the second guide rail extending transversely relative to the first guide rail in a mounted position, - a guiding device to be connected to one of the furniture parts (3a, 3b), the guiding device being movable relative to the first and second guide rail (9, 13a) and configured to be transferred in a crossing region, seen in a top view onto the first and second guide rails (9, 13a) in the mounted position, between the first and second guide rail (9, 13a), the crossing region being a region where the guide rails (9, 13a) or notional extensions of the guide rails (9, 13a) intersect with one another when viewed from above, - wherein the guide system includes a drive device having an entrainment member which is acted upon by at least one force storage member, the entrainment member being configured to be releasably coupled to the guiding device, wherein the entrainment member is locked in a parking position and wherein the entrainment member can be unlocked by an entry of the guiding device into the crossing region such that the entrainment member, jointly with the guiding device coupled therewith, can be retracted from the crossing region at least over a region along the second guide rail by a force of the at least one force storage member, - wherein the guide system includes a column vertically extending in the mounted position, and the entrainment member is pivotally supported about a pivoting axis on the column, characterized in that the column, jointly with the guiding device, is movably supported via supporting rollers (17a, 17b) along second guide rails (13a, 13b) to be fixed to a sidewall of an item of furniture, wherein the first guide rail and the second guide rails (13a, 13b) are spaced from one another in a height direction in the mounted position. - a first guide rail for guiding the furniture parts (3a, 3b), - a second guide rail for guiding the furniture parts (3a, 3b), the second guide rail extending transversely relative to the first guide rail in a mounted position, - a guiding device to be connected to one of the furniture parts (3a, 3b), the guiding device being movable relative to the first and second guide rail (9, 13a) and configured to be transferred in a crossing region, seen in a top view onto the first and second guide rails (9, 13a) in the mounted position, between the first and second guide rail (9, 13a), the crossing region being a region where the guide rails (9, 13a) or notional extensions of the guide rails (9, 13a) intersect with one another when viewed from above, - wherein the guide system includes a drive device having an entrainment member which is acted upon by at least one force storage member, the entrainment member being configured to be releasably coupled to the guiding device, wherein the entrainment member is locked in a parking position and wherein the entrainment member can be unlocked by an entry of the guiding device into the crossing region such that the entrainment member, jointly with the guiding device coupled therewith, can be retracted from the crossing region at least over a region along the second guide rail by a force of the at least one force storage member, - wherein the guide system includes a column vertically extending in the mounted position, and the entrainment member is pivotally supported about a pivoting axis on the column, characterized in that the column, jointly with the guiding device, is movably supported via supporting rollers (17a, 17b) along second guide rails (13a, 13b) to be fixed to a sidewall of an item of furniture, wherein the first guide rail and the second guide rails (13a, 13b) are spaced from one another in a height direction in the mounted position.