A multicyclic compound including nitrogen represented by the following Formula 1: in Formula 1, at least one of R4 and R5 is - q -Ar2, L1 and L2 are the same as or different from each other, and are each independently a direct bond; a substituted or unsubstituted alkylene; a substituted or unsubstituted arylene; or a substituted or unsubstituted heteroarylene, Ar1 and Ar2 are the same as or different from each other, and are each independently a substituted or unsubstituted heterocyclic group, R1 and R2 are hydrogen, R3 to R6 are the same as or different from each other, and are each independently hydrogen; deuterium; a halogen group; a nitrile group; a nitro group; a hydroxy group; a carbonyl group; an ester group; an imide group; an amino group; a substituted or unsubstituted silyl group; a substituted or unsubstituted boron group; a substituted or unsubstituted alkyl group; a substituted or unsubstituted cycloalkyl group; a substituted or unsubstituted alkoxy group; a substituted or unsubstituted aryloxy group; a substituted or unsubstituted alkylthioxy group; a substituted or unsubstituted arylthioxy group; a substituted or unsubstituted alkylsulfoxy group; a substituted or unsubstituted arylsulfoxy group; a substituted or unsubstituted alkenyl group; a substituted or unsubstituted aralkyl group; a substituted or unsubstituted aralkenyl group; a substituted or unsubstituted alkylaryl group; a substituted or unsubstituted alkylamine group; a substituted or unsubstituted aralkylamine group; a substituted or unsubstituted heteroarylamine group; a substituted or unsubstituted arylamine group; a substituted or unsubstituted arylheteroarylamine group; a substituted or unsubstituted arylphosphine group; a substituted or unsubstituted phosphine oxide group; a substituted or unsubstituted aryl group; or a substituted or unsubstituted heterocyclic group, or combine with an adjacent group to form a ring, a is an integer of 0 to 4, b is an integer of 0 to 2, p and q are the same as or different from each other, and are each independently an integer of 0 to 5, and when a, b, p, and q are each 2 or more, the structures in the parenthesis are the same as or different from each other. at least one of R4 and R5 is - q -Ar2, L1 and L2 are the same as or different from each other, and are each independently a direct bond; a substituted or unsubstituted alkylene; a substituted or unsubstituted arylene; or a substituted or unsubstituted heteroarylene, Ar1 and Ar2 are the same as or different from each other, and are each independently a substituted or unsubstituted heterocyclic group, R1 and R2 are hydrogen, R3 to R6 are the same as or different from each other, and are each independently hydrogen; deuterium; a halogen group; a nitrile group; a nitro group; a hydroxy group; a carbonyl group; an ester group; an imide group; an amino group; a substituted or unsubstituted silyl group; a substituted or unsubstituted boron group; a substituted or unsubstituted alkyl group; a substituted or unsubstituted cycloalkyl group; a substituted or unsubstituted alkoxy group; a substituted or unsubstituted aryloxy group; a substituted or unsubstituted alkylthioxy group; a substituted or unsubstituted arylthioxy group; a substituted or unsubstituted alkylsulfoxy group; a substituted or unsubstituted arylsulfoxy group; a substituted or unsubstituted alkenyl group; a substituted or unsubstituted aralkyl group; a substituted or unsubstituted aralkenyl group; a substituted or unsubstituted alkylaryl group; a substituted or unsubstituted alkylamine group; a substituted or unsubstituted aralkylamine group; a substituted or unsubstituted heteroarylamine group; a substituted or unsubstituted arylamine group; a substituted or unsubstituted arylheteroarylamine group; a substituted or unsubstituted arylphosphine group; a substituted or unsubstituted phosphine oxide group; a substituted or unsubstituted aryl group; or a substituted or unsubstituted heterocyclic group, or combine with an adjacent group to form a ring, a is an integer of 0 to 4, b is an integer of 0 to 2, p and q are the same as or different from each other, and are each independently an integer of 0 to 5, and when a, b, p, and q are each 2 or more, the structures in the parenthesis are the same as or different from each other.