A compound represented by Chemical Formula 1: wherein, in Chemical Formula 1, Ar 1 is a substituted or unsubstituted C6 to C30 arene group, a substituted or unsubstituted C3 to C30 heteroarene group, or a condensed ring thereof, X is O, S, Se, Te, S(=O), S(=O) 2, NR a, SiR b R c, GeR d R e, or CR f R g (wherein R a, R b, R c, R d, R e, R f, and R g are independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, or a substituted or unsubstituted C6 to C10 aryl group, wherein R b, R c, R d, R e, R f, and R g are independently present or at least one pair selected from R b and R c, R d and R e, and R f and R g are linked to each other to form a spiro structure, Ar 2 is a substituted or unsubstituted C6 to C30 hydrocarbon ring group having at least one functional group selected from C=O, C=S, C=Se, and C=Te, a substituted or unsubstituted C2 to C30 heterocyclic group having at least one functional group selected from C=O, C=S, C=Se, and C=Te, or a fused ring group thereof, R 1 to R 3 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heteroaryl group, a substituted or unsubstituted C2 to C30 acyl group, a halogen, a cyano group (-CN), a cyano-containing group, a nitro group, a pentafluorosulfanyl group (-SF 5), a hydroxyl group, an amine group, a hydrazine group, a hydrazone group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, -SiR a R b R c (wherein R a, R b and R c are independently hydrogen or a substituted or unsubstituted C1 to C10 alkyl group), or a combination thereof, R 4 is hydrogen, deuterium, a halogen, a cyano group, a nitro group, a hydroxyl group, an amine group, a substituted or unsubstituted C1 to C10 alkyl group, or a substituted or unsubstituted C1 to C10 alkoxy group, and a is an integer of 0 to 4. Ar 1 is a substituted or unsubstituted C6 to C30 arene group, a substituted or unsubstituted C3 to C30 heteroarene group, or a condensed ring thereof, X is O, S, Se, Te, S(=O), S(=O) 2, NR a, SiR b R c, GeR d R e, or CR f R g (wherein R a, R b, R c, R d, R e, R f, and R g are independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, or a substituted or unsubstituted C6 to C10 aryl group, wherein R b, R c, R d, R e, R f, and R g are independently present or at least one pair selected from R b and R c, R d and R e, and R f and R g are linked to each other to form a spiro structure, Ar 2 is a substituted or unsubstituted C6 to C30 hydrocarbon ring group having at least one functional group selected from C=O, C=S, C=Se, and C=Te, a substituted or unsubstituted C2 to C30 heterocyclic group having at least one functional group selected from C=O, C=S, C=Se, and C=Te, or a fused ring group thereof, R 1 to R 3 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heteroaryl group, a substituted or unsubstituted C2 to C30 acyl group, a halogen, a cyano group (-CN), a cyano-containing group, a nitro group, a pentafluorosulfanyl group (-SF 5), a hydroxyl group, an amine group, a hydrazine group, a hydrazone group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, -SiR a R b R c (wherein R a, R b and R c are independently hydrogen or a substituted or unsubstituted C1 to C10 alkyl group), or a combination thereof, R 4 is hydrogen, deuterium, a halogen, a cyano group, a nitro group, a hydroxyl group, an amine group, a substituted or unsubstituted C1 to C10 alkyl group, or a substituted or unsubstituted C1 to C10 alkoxy group, and a is an integer of 0 to 4.