An olefin-based polymer satisfying the following conditions to: a melt index MI, determined at 190°C under a load of 2.16 kg, is from 0.1 g/10 min to 10.0 g/10 min, a melting temperature, when measured by differential scanning calorimetry, is from 20°C to 70°C, and a high temperature melting peak is confirmed at 75°C to 150°C when measured by a differential scanning calorimetry precise measurement method, and a total enthalpy of fusion ΔH of the corresponding region is 1.0 J/g or more, and a density (d) is from 0.850 g/cc to 0.890 g/cc; wherein the olefin-based polymer is a copolymer of ethylene and any one selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, and 1-octene, or mixtures of two or more thereof; wherein the measurement of a melting temperature (Tm) using differential scanning calorimetry is performed by a first cycle including heating to a temperature higher by 30°C than the melting temperature (Tm) at a constant rate, and cooling to a temperature lower by 30°C than a glass transition temperature (Tg) at a constant rate, and a second cycle to obtain the peak of a standard melting temperature (Tm), and wherein the differential scanning calorimetry precise measurement method is a method of obtaining crystal information by undergoing a process of heating immediately before the peak of a melting temperature (Tm) and cooling after the first cycle using differential scanning calorimetry, and repeatedly performing heating to a temperature reduced by 5°C and cooling; and wherein the density, the high temperature melting peak, and the total enthalpy of fusion ΔH are determined in accordance with the methods described in the specification. a melt index MI, determined at 190°C under a load of 2.16 kg, is from 0.1 g/10 min to 10.0 g/10 min, a melting temperature, when measured by differential scanning calorimetry, is from 20°C to 70°C, and a high temperature melting peak is confirmed at 75°C to 150°C when measured by a differential scanning calorimetry precise measurement method, and a total enthalpy of fusion ΔH of the corresponding region is 1.0 J/g or more, and a density (d) is from 0.850 g/cc to 0.890 g/cc; wherein the olefin-based polymer is a copolymer of ethylene and any one selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, and 1-octene, or mixtures of two or more thereof; wherein the measurement of a melting temperature (Tm) using differential scanning calorimetry is performed by a first cycle including heating to a temperature higher by 30°C than the melting temperature (Tm) at a constant rate, and cooling to a temperature lower by 30°C than a glass transition temperature (Tg) at a constant rate, and a second cycle to obtain the peak of a standard melting temperature (Tm), and wherein the differential scanning calorimetry precise measurement method is a method of obtaining crystal information by undergoing a process of heating immediately before the peak of a melting temperature (Tm) and cooling after the first cycle using differential scanning calorimetry, and repeatedly performing heating to a temperature reduced by 5°C and cooling; and wherein the density, the high temperature melting peak, and the total enthalpy of fusion ΔH are determined in accordance with the methods described in the specification. wherein the olefin-based polymer is a copolymer of ethylene and any one selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, and 1-octene, or mixtures of two or more thereof; wherein the measurement of a melting temperature (Tm) using differential scanning calorimetry is performed by a first cycle including heating to a temperature higher by 30°C than the melting temperature (Tm) at a constant rate, and cooling to a temperature lower by 30°C than a glass transition temperature (Tg) at a constant rate, and a second cycle to obtain the peak of a standard melting temperature (Tm), and wherein the differential scanning calorimetry precise measurement method is a method of obtaining crystal information by undergoing a process of heating immediately before the peak of a melting temperature (Tm) and cooling after the first cycle using differential scanning calorimetry, and repeatedly performing heating to a temperature reduced by 5°C and cooling; and wherein the density, the high temperature melting peak, and the total enthalpy of fusion ΔH are determined in accordance with the methods described in the specification.