A compound represented by Chemical Formula 1, a tautomer thereof, a stereoisomer thereof and their mixture, or a pharmaceutically acceptable salt thereof: wherein, X is CHR 4 ; Y is N or C; 1 is 1; R 1 is hydrogen, hydroxyl or C 1-6 alkyl {herein, if Y is N, R 1 is null}; R 2 is R 4 is hydrogen; m is 0; n is 1, 2 or 3; each of R 5 is independently -Z-(CH 2 ) p -R 6 , halo or C 1-6 hydroxyalkyl; Z is -O- or null; p is 0, 1, 2, 3, 4, 5 or 6; R 6 is hydrogen, hydroxyl, -OR 8 , -O-(C=O)-R 8 , -(C=O)-R 8 , -(C=O)OR 8 , -NR 9 R 10 , C 1-6 dihydroxyalkyl, C 1-6 haloalkyl unsubstituted or optionally substituted with hydroxyl, C 3-7 cycloalkyl, heterocyclyl, C 5-10 aryl or heteroaryl; R 8 is hydrogen, C 1-6 alkyl, C 1-6 aminoalkyl, or heterocyclyl; each of R 9 and R 10 is independently hydrogen, C 1-6 alkyl, or C 1-3 alkyl-C 3-6 cycloalkyl; each of the heteroaryls is a 5- to 10-membered single or fused ring containing one or more heteroatoms selected from the group consisting of N, O, S and a combination thereof, and each of the heterocyclyls is a 3- to 10-membered single or fused ring containing one or more heteroatoms selected from the group consisting of N, O, S and a combination thereof; one or more than one hydrogen of each of the cycloalkyls and heterocyclyls may be unsubstituted or substituted with hydroxyl, oxo, halo, cyano, nitro, C 1-6 alkyl, C 1-6 hydroxyalkyl, C 1-6 haloalkyl, C 1-6 alkoxy, formyl, C 1-6 alkylformyl, carboxy, C 1-6 alkylcarboxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, carbamoyl, C 1-6 alkylcarbamoyl or di(C 1-6 alkyl)carbamoyl; and one or more than one hydrogen of each of the aryls and heteroaryls may be unsubstituted or substituted with hydroxyl, oxo, halo, cyano, nitro, C 1-6 alkyl, C 1-6 alkoxy, C 1-6 hydroxyalkyl, C 1-6 haloalkyl, pyrazinyl, formyl, C 1-6 alkylformyl, carboxy, C 1-6 alkylcarboxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, carbamoyl, C 1-6 alkylcarbamoyl, di(C 1-6 alkyl)carbamoyl or C 1-6 alkylsulfonyl. X is CHR 4 ; Y is N or C; 1 is 1; R 1 is hydrogen, hydroxyl or C 1-6 alkyl {herein, if Y is N, R 1 is null}; R 2 is R 4 is hydrogen; m is 0; n is 1, 2 or 3; each of R 5 is independently -Z-(CH 2 ) p -R 6 , halo or C 1-6 hydroxyalkyl; Z is -O- or null; p is 0, 1, 2, 3, 4, 5 or 6; R 6 is hydrogen, hydroxyl, -OR 8 , -O-(C=O)-R 8 , -(C=O)-R 8 , -(C=O)OR 8 , -NR 9 R 10 , C 1-6 dihydroxyalkyl, C 1-6 haloalkyl unsubstituted or optionally substituted with hydroxyl, C 3-7 cycloalkyl, heterocyclyl, C 5-10 aryl or heteroaryl; R 8 is hydrogen, C 1-6 alkyl, C 1-6 aminoalkyl, or heterocyclyl; each of R 9 and R 10 is independently hydrogen, C 1-6 alkyl, or C 1-3 alkyl-C 3-6 cycloalkyl; each of the heteroaryls is a 5- to 10-membered single or fused ring containing one or more heteroatoms selected from the group consisting of N, O, S and a combination thereof, and each of the heterocyclyls is a 3- to 10-membered single or fused ring containing one or more heteroatoms selected from the group consisting of N, O, S and a combination thereof; one or more than one hydrogen of each of the cycloalkyls and heterocyclyls may be unsubstituted or substituted with hydroxyl, oxo, halo, cyano, nitro, C 1-6 alkyl, C 1-6 hydroxyalkyl, C 1-6 haloalkyl, C 1-6 alkoxy, formyl, C 1-6 alkylformyl, carboxy, C 1-6 alkylcarboxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, carbamoyl, C 1-6 alkylcarbamoyl or di(C 1-6 alkyl)carbamoyl; and one or more than one hydrogen of each of the aryls and heteroaryls may be unsubstituted or substituted with hydroxyl, oxo, halo, cyano, nitro, C 1-6 alkyl, C 1-6 alkoxy, C 1-6 hydroxyalkyl, C 1-6 haloalkyl, pyrazinyl, formyl, C 1-6 alkylformyl, carboxy, C 1-6 alkylcarboxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, carbamoyl, C 1-6 alkylcarbamoyl, di(C 1-6 alkyl)carbamoyl or C 1-6 alkylsulfonyl. <EOS>