A laminate comprising: a carrier substrate; a debonding layer disposed on at least one surface of the carrier substrate and comprising a polyimide resin; and a flexible substrate disposed on the debonding layer, Wherein the polyimide resin has a similarity score not greater than 0.5, as calculated by Equation 1: Similarity score = α FIT k 1 × Ls Dianhydride, i + k 2 × Ls Diamine, j k 0 where Ls Dianhydride,i = Exp[-k 3 × Coeff i] × V i y 0 Ls Diamine,j = Exp[-k 4 × Coeff j] × V j y 0 k 0 = 2.00, y 0 = -1.00, k 1 = 206.67, k 2 = 124.78, k 3 = 3.20, k 4 = 5.90, Coeff i and Coeff j are molecular asphericities calculated from the structures of dianhydride i and diamine j as monomers of the polyimide, respectively, using ADRIANA.Code (Molecular Networks GmbH), V i and V j are McGowan volumes calculated from the structures of dianhydride i and diamine j as the monomers, respectively, using ADRIANA.Code (Molecular Networks GmbH), and α FIT is 1.0 if exp(-4.0×| Coeff i - Coeff j |) + 0.08 < 0.90 and is a constant from 0.1 to 0.95 if exp(-4.0×| Coeff i - Coeff j |) + 0.08 ≥ 0.90, wherein the polyimide resin is prepared by reacting a tetracarboxylic dianhydride of Formula 1: wherein A is a tetravalent aromatic organic group of Formula 2a or 2b: wherein R 11 is a C 1 -C 4 alkyl or C 1 -C 4 haloalkyl group, a is an integer from 0 to 3, and b is an integer from 0 to 2, wherein R 12 to R 14 are each independently a C 1 -C 4 alkyl or C 1 -C 4 haloalkyl group, c and e are each independently an integer from 0 to 3, d is an integer from 0 to 4, and f is an integer from 0 to 3, with an aromatic diamine compound having a linear structure to prepare a polyamic acid, wherein the aromatic diamine compound is represented by Formula 4a or 4b: wherein R 21 is a C 1 -C 10 alkyl or C 1 -C 10 haloalkyl group and 1 is an integer from 0 to 4, wherein R 22 and R 23 are each independently a C 1 -C 10 alkyl or C 1 -C 10 haloalkyl group, X is selected from the group consisting of -CR 24 R 25 -, -C(=O)-, -C(=O)O-, -C(=O)NH-, -S-,-SO-, -SO 2 -, -O[CH 2 CH 2 O] q -, C 6 -C 18 monocyclic and polycyclic cycloalkylene groups, C 6 -C 18 monocyclic and polycyclic arylene groups, and combinations thereof, R 24 and R 25 are each independently selected from the group consisting of a hydrogen atom, C 1 -C 10 alkyl groups, and C 1 -C 10 haloalkyl groups, q is an integer of 1 or 2, m and n are each independently an integer from 0 to 4, and p is an integer of 0 or 1, wherein the flexible substrate has a structure of a polymer layer, wherein the polymer layer comprises at least one polymer resin of polyimide. a carrier substrate; a debonding layer disposed on at least one surface of the carrier substrate and comprising a polyimide resin; and a flexible substrate disposed on the debonding layer, Wherein the polyimide resin has a similarity score not greater than 0.5, as calculated by Equation 1: Similarity score = α FIT k 1 × Ls Dianhydride, i + k 2 × Ls Diamine, j k 0 where Ls Dianhydride,i = Exp[-k 3 × Coeff i] × V i y 0 Ls Diamine,j = Exp[-k 4 × Coeff j] × V j y 0 k 0 = 2.00, y 0 = -1.00, k 1 = 206.67, k 2 = 124.78, k 3 = 3.20, k 4 = 5.90, Ls Dianhydride,i = Exp[-k 3 × Coeff i] × V i y 0 Ls Diamine,j = Exp[-k 4 × Coeff j] × V j y 0 k 0 = 2.00, y 0 = -1.00, k 1 = 206.67, k 2 = 124.78, k 3 = 3.20, k 4 = 5.90, Coeff i and Coeff j are molecular asphericities calculated from the structures of dianhydride i and diamine j as monomers of the polyimide, respectively, using ADRIANA.Code (Molecular Networks GmbH), V i and V j are McGowan volumes calculated from the structures of dianhydride i and diamine j as the monomers, respectively, using ADRIANA.Code (Molecular Networks GmbH), and α FIT is 1.0 if exp(-4.0×| Coeff i - Coeff j |) + 0.08 < 0.90 and is a constant from 0.1 to 0.95 if exp(-4.0×| Coeff i - Coeff j |) + 0.08 ≥ 0.90, wherein the polyimide resin is prepared by reacting a tetracarboxylic dianhydride of Formula 1: wherein A is a tetravalent aromatic organic group of Formula 2a or 2b: wherein R 11 is a C 1 -C 4 alkyl or C 1 -C 4 haloalkyl group, a is an integer from 0 to 3, and b is an integer from 0 to 2, wherein R 12 to R 14 are each independently a C 1 -C 4 alkyl or C 1 -C 4 haloalkyl group, c and e are each independently an integer from 0 to 3, d is an integer from 0 to 4, and f is an integer from 0 to 3, with an aromatic diamine compound having a linear structure to prepare a polyamic acid, wherein the aromatic diamine compound is represented by Formula 4a or 4b: wherein R 21 is a C 1 -C 10 alkyl or C 1 -C 10 haloalkyl group and 1 is an integer from 0 to 4, wherein R 22 and R 23 are each independently a C 1 -C 10 alkyl or C 1 -C 10 haloalkyl group, X is selected from the group consisting of -CR 24 R 25 -, -C(=O)-, -C(=O)O-, -C(=O)NH-, -S-,-SO-, -SO 2 -, -O[CH 2 CH 2 O] q -, C 6 -C 18 monocyclic and polycyclic cycloalkylene groups, C 6 -C 18 monocyclic and polycyclic arylene groups, and combinations thereof, R 24 and R 25 are each independently selected from the group consisting of a hydrogen atom, C 1 -C 10 alkyl groups, and C 1 -C 10 haloalkyl groups, q is an integer of 1 or 2, m and n are each independently an integer from 0 to 4, and p is an integer of 0 or 1, wherein the flexible substrate has a structure of a polymer layer, wherein the polymer layer comprises at least one polymer resin of polyimide.