A tricyclic compound represented by the following Chemical Formula 1: [A 1 and A 2 are each independently N or CH, A 3 is N or CR 1, R 1 is hydrogen, a halogen, -COOR 5 or a (C3-C12)heteroaryl, R 2 is hydrogen, an amino group, -COOR 6, a (C1-C12)heteroaryl, a (C1-C12)heteroaryl fused to a (C3-C12)cycloalkyl, a (C6-C12)aryl, or a 5- to 7-membered heterocyclic amino comprising one or more heteroatoms selected from nitrogen, oxygen and sulfur, R 3 is hydrogen or a (C6-C12)aryl, R 4 is -L 1 -L 2 -R 7, an amino group (-NH 2), a (C1-C12)heteroaryl or a (C6-C12)aryl of R 2 is arbitrarily substituted with at least one or more groups selected from the group consisting of a (C1-C4)alkyl, a (C1-C4)alkyl substituted with a halogen, a (C1-C4)thioalkyl, an amino group (-NH 2), a methylamino group (-NHCH 3), a dimethylamino group (-N(CH 3) 2), -CH 2 OH, a (C1-C4)alkoxy, a hydroxyl group (-OH), a halogen, a methanesulfonyl group (-SO 2 CH 3), -SO 2 N(CH 3) 2, a nitro group (-NO 2), a cyano group (-CN), a (C6-C12)aryl of R 3 is arbitrarily substituted with a nitro group (-NO 2), L 1 is -N(R 8)- or -O-, L 2 is -(CH 2) m -, or and m is an integer from 2 to 5, R 7 is -N(R 9) 2, -OR 10, -SO 2 CH 3, -SO 2 N(CH 3) 2, or a 5- to 7-membered heterocyclic amino comprising one or more heteroatoms selected from nitrogen, oxygen and sulfur, R 5 is a (C1-C4)alkyl, R 6 is a (C1-C4)alkyl, R 8 is hydrogen or a (C1-C4), R 9 is a (C1-C4)alkyl, R 10 is a (C1-C4)alkyl, a heterocyclic amino of R 7 is arbitrarily selected from at least one or more groups selected from the group consisting of -SO 2 CH 3 and -COOC(CH 3) 3 (-Boc), when A 3 is CR 1 and R 1 is a halogen, -COOR 5 or a (C3-C12)heteroaryl, L 2 is not -(CH 2) m -, when L 2 is -(CH 2) m -, R 7 is neither -N(R 9) 2 nor -OR 10, and when A 3 is CR 1, a case where both R 1 and R 2 are hydrogen is excluded.] [A 1 and A 2 are each independently N or CH, A 3 is N or CR 1, R 1 is hydrogen, a halogen, -COOR 5 or a (C3-C12)heteroaryl, R 2 is hydrogen, an amino group, -COOR 6, a (C1-C12)heteroaryl, a (C1-C12)heteroaryl fused to a (C3-C12)cycloalkyl, a (C6-C12)aryl, or a 5- to 7-membered heterocyclic amino comprising one or more heteroatoms selected from nitrogen, oxygen and sulfur, R 3 is hydrogen or a (C6-C12)aryl, R 4 is -L 1 -L 2 -R 7, an amino group (-NH 2), a (C1-C12)heteroaryl or a (C6-C12)aryl of R 2 is arbitrarily substituted with at least one or more groups selected from the group consisting of a (C1-C4)alkyl, a (C1-C4)alkyl substituted with a halogen, a (C1-C4)thioalkyl, an amino group (-NH 2), a methylamino group (-NHCH 3), a dimethylamino group (-N(CH 3) 2), -CH 2 OH, a (C1-C4)alkoxy, a hydroxyl group (-OH), a halogen, a methanesulfonyl group (-SO 2 CH 3), -SO 2 N(CH 3) 2, a nitro group (-NO 2), a cyano group (-CN), a (C6-C12)aryl of R 3 is arbitrarily substituted with a nitro group (-NO 2), L 1 is -N(R 8)- or -O-, L 2 is -(CH 2) m -, or and m is an integer from 2 to 5, R 7 is -N(R 9) 2, -OR 10, -SO 2 CH 3, -SO 2 N(CH 3) 2, or a 5- to 7-membered heterocyclic amino comprising one or more heteroatoms selected from nitrogen, oxygen and sulfur, R 5 is a (C1-C4)alkyl, R 6 is a (C1-C4)alkyl, R 8 is hydrogen or a (C1-C4), R 9 is a (C1-C4)alkyl, R 10 is a (C1-C4)alkyl, a heterocyclic amino of R 7 is arbitrarily selected from at least one or more groups selected from the group consisting of -SO 2 CH 3 and -COOC(CH 3) 3 (-Boc), when A 3 is CR 1 and R 1 is a halogen, -COOR 5 or a (C3-C12)heteroaryl, L 2 is not -(CH 2) m -, when L 2 is -(CH 2) m -, R 7 is neither -N(R 9) 2 nor -OR 10, and when A 3 is CR 1, a case where both R 1 and R 2 are hydrogen is excluded.]