A hetero-cyclic compound represented by the following Chemical Formula 1: in Chemical Formula 1, L1 is a direct bond or a substituted or unsubstituted C 6 to C 60 arylene group, Ar1 is a substituted or unsubstituted C 6 to C 60 aryl group; or a substituted or unsubstituted C 2 to C 60 heteroaryl group comprising at least one of S and O, Ar2 is a substituted or unsubstituted C 6 to C 60 aryl group; or a substituted or unsubstituted C 2 to C 60 heteroaryl group, R1 to R4 are the same as or different from each other, and are each independently selected from the group consisting of hydrogen; deuterium; a halogen group; -CN; a substituted or unsubstituted C 1 to C 60 alkyl group; a substituted or unsubstituted C 2 to C 60 alkenyl group; a substituted or unsubstituted C 2 to C 60 alkynyl group; a substituted or unsubstituted C 1 to C 60 alkoxy group; a substituted or unsubstituted C 3 to C 60 cycloalkyl group; a substituted or unsubstituted C 2 to C 60 heterocycloalkyl group; a substituted or unsubstituted C 6 to C 60 aryl group; a substituted or unsubstituted C 2 to C 60 heteroaryl group; - SiRR'R"; -P(=O)RR'; and an amine group which is unsubstituted or substituted with a C 1 to C 20 alkyl group, a substituted or unsubstituted C 6 to C 60 aryl group, or a C 2 to C 60 heteroaryl group, or two or more adjacent groups are bonded to each other to form a substituted or unsubstituted aliphatic or aromatic hydrocarbon ring, R, R', and R" are the same as or different from each other, and are each independently hydrogen; deuterium; -CN; a substituted or unsubstituted C 1 to C 60 alkyl group; a substituted or unsubstituted C 3 to C 60 cycloalkyl group; a substituted or unsubstituted C 6 to C 60 aryl group; or a substituted or unsubstituted C 2 to C 60 heteroaryl group, m, p, and q are each independently an integer from 0 to 4, and n is an integer from 0 to 2. L1 is a direct bond or a substituted or unsubstituted C 6 to C 60 arylene group, Ar1 is a substituted or unsubstituted C 6 to C 60 aryl group; or a substituted or unsubstituted C 2 to C 60 heteroaryl group comprising at least one of S and O, Ar2 is a substituted or unsubstituted C 6 to C 60 aryl group; or a substituted or unsubstituted C 2 to C 60 heteroaryl group, R1 to R4 are the same as or different from each other, and are each independently selected from the group consisting of hydrogen; deuterium; a halogen group; -CN; a substituted or unsubstituted C 1 to C 60 alkyl group; a substituted or unsubstituted C 2 to C 60 alkenyl group; a substituted or unsubstituted C 2 to C 60 alkynyl group; a substituted or unsubstituted C 1 to C 60 alkoxy group; a substituted or unsubstituted C 3 to C 60 cycloalkyl group; a substituted or unsubstituted C 2 to C 60 heterocycloalkyl group; a substituted or unsubstituted C 6 to C 60 aryl group; a substituted or unsubstituted C 2 to C 60 heteroaryl group; - SiRR'R"; -P(=O)RR'; and an amine group which is unsubstituted or substituted with a C 1 to C 20 alkyl group, a substituted or unsubstituted C 6 to C 60 aryl group, or a C 2 to C 60 heteroaryl group, or two or more adjacent groups are bonded to each other to form a substituted or unsubstituted aliphatic or aromatic hydrocarbon ring, R, R', and R" are the same as or different from each other, and are each independently hydrogen; deuterium; -CN; a substituted or unsubstituted C 1 to C 60 alkyl group; a substituted or unsubstituted C 3 to C 60 cycloalkyl group; a substituted or unsubstituted C 6 to C 60 aryl group; or a substituted or unsubstituted C 2 to C 60 heteroaryl group, m, p, and q are each independently an integer from 0 to 4, and n is an integer from 0 to 2.