A compound of Formula 1: wherein: Ar 1 to Ar 6 are each independently selected from the group consisting of a C 6 -C 60 aryl group, a fluorenyl group, a C 2 -C 60 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P, a C 3 -C 60 aliphatic ring group, -L'-N(R a)(R b), Formula A-1 and Formula A-2, and at least one of Ar 1 to Ar 6 is Formula A-1 or Formula A-2, X 1 is O or S, X 2 is N(R'), O or S, R 1 to R 6 are each independently selected from the group consisting of hydrogen, deuterium, halogen, cyano group, nitro group, a C 6 -C 60 aryl group, a fluorenyl group, a C 2 -C 60 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P, a C 3 -C 60 aliphatic ring group, a C 1 -C 30 alkyl group, a C 2 -C 30 alkenyl group, a C 2 -C 30 alkynyl group, a C 1 -C 30 alkoxyl group, a C 6 -C 30 aryloxy group and -L'-N(R a)(R b), and adjacent groups together may be bonded to each other to form a ring, n, p' and r' are each an integer of 0 to 3, m, o, p, q and r are each an integer of 0 to 4, where they are each an integer of 2 or more, each of R 1 s, each of R 2 s, each of R 3 s, each of R 4 s, each of R 5 s, each of R 6 s is the same or different from each other, x and y are each an integer of 0 to 2, and x+y is an integer greater than or equal to 1, L 1 to L 3 and L' are each independently selected from the group consisting of a single bond, a C 6 -C 60 arylene group, a fluorenylene group, a C 3 -C 60 aliphatic ring group and a C 2 -C 60 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P, R', R a and R b are each independently selected from the group consisting of a C 6 -C 60 aryl group, a fluorenyl group, a C 2 -C 60 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P and a C 3 -C 60 aliphatic ring group, Ar 1 to Ar 6, R 1 to R 6, L 1 to L 3, R' and the ring formed by adjacent groups may be each optionally substituted with one or more substituents selected from the group consisting of deuterium, halogen, a silane group unsubstituted or substituted with a C 1 -C 20 alkyl group or a C 6 -C 20 aryl group, a siloxane group, a boron group, a germanium group, a cyano group, a nitro group, a C 1 -C 20 alkylthio group, a C 1 -C 20 alkoxyl group, a C 6 -C 20 aryloxy group, a C 6 -C 20 arylthio group, a C 1 -C 20 alkyl group, a C 2 -C 20 alkenyl group, a C 2 -C 20 alkynyl group, a C 6 -C 20 aryl group, a fluorenyl group, a C 2 -C 20 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P, a C 3 -C 20 aliphatic ring group, a C 7 -C 20 arylalkyl group, and C 8 -C 20 arylalkenyl group. Ar 1 to Ar 6 are each independently selected from the group consisting of a C 6 -C 60 aryl group, a fluorenyl group, a C 2 -C 60 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P, a C 3 -C 60 aliphatic ring group, -L'-N(R a)(R b), Formula A-1 and Formula A-2, and at least one of Ar 1 to Ar 6 is Formula A-1 or Formula A-2, X 1 is O or S, X 2 is N(R'), O or S, R 1 to R 6 are each independently selected from the group consisting of hydrogen, deuterium, halogen, cyano group, nitro group, a C 6 -C 60 aryl group, a fluorenyl group, a C 2 -C 60 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P, a C 3 -C 60 aliphatic ring group, a C 1 -C 30 alkyl group, a C 2 -C 30 alkenyl group, a C 2 -C 30 alkynyl group, a C 1 -C 30 alkoxyl group, a C 6 -C 30 aryloxy group and -L'-N(R a)(R b), and adjacent groups together may be bonded to each other to form a ring, n, p' and r' are each an integer of 0 to 3, m, o, p, q and r are each an integer of 0 to 4, where they are each an integer of 2 or more, each of R 1 s, each of R 2 s, each of R 3 s, each of R 4 s, each of R 5 s, each of R 6 s is the same or different from each other, x and y are each an integer of 0 to 2, and x+y is an integer greater than or equal to 1, L 1 to L 3 and L' are each independently selected from the group consisting of a single bond, a C 6 -C 60 arylene group, a fluorenylene group, a C 3 -C 60 aliphatic ring group and a C 2 -C 60 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P, R', R a and R b are each independently selected from the group consisting of a C 6 -C 60 aryl group, a fluorenyl group, a C 2 -C 60 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P and a C 3 -C 60 aliphatic ring group, Ar 1 to Ar 6, R 1 to R 6, L 1 to L 3, R' and the ring formed by adjacent groups may be each optionally substituted with one or more substituents selected from the group consisting of deuterium, halogen, a silane group unsubstituted or substituted with a C 1 -C 20 alkyl group or a C 6 -C 20 aryl group, a siloxane group, a boron group, a germanium group, a cyano group, a nitro group, a C 1 -C 20 alkylthio group, a C 1 -C 20 alkoxyl group, a C 6 -C 20 aryloxy group, a C 6 -C 20 arylthio group, a C 1 -C 20 alkyl group, a C 2 -C 20 alkenyl group, a C 2 -C 20 alkynyl group, a C 6 -C 20 aryl group, a fluorenyl group, a C 2 -C 20 heterocyclic group containing at least one heteroatom of O, N, S, Si, and P, a C 3 -C 20 aliphatic ring group, a C 7 -C 20 arylalkyl group, and C 8 -C 20 arylalkenyl group.