A Group 4 transition metal compound represented by Formula 1 below: wherein, in Formula 1, M is a Group 4 transition metal of Ti, Zr, Hf, or Rf; each of X 1 and X 2 is independently halogen, C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkynyl, C 6-20 aryl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 1-20 alkylamido, C 6-20 arylamido, or C 1-20 alkylidene; R 3 and R 4 is independently hydrogen, substituted or unsubstituted C 1-20 alkyl, substituted or unsubstituted C 2-20 alkenyl, substituted or unsubstituted C 2-20 alkynyl, substituted or unsubstituted C 6-20 aryl, substituted or unsubstituted C 7-40 alkylaryl, substituted or unsubstituted C 7-40 arylalkyl, or substituted or unsubstituted C 1-20 silyl, and R 1 and R 2, and R 5 and R 6 are linked together to form a substituted or unsubstituted six-membered ring, wherein the ring members consist of five carbon atoms and one nitrogen atom, and these ring-forming carbon atoms comprised in R 1, R 2, R 5 and R 6 are saturated, wherein each substituent is independently halogen, C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkynyl, C 6-20 aryl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 1-20 alkylamido, C 6-20 arylamido, or C 1-20 alkylidene; C1 and C2 are both nitrogen or both oxygen; wherein: i) when C 1 and C 2 are both nitrogen, any one of F 1 to F 3 is hydrogen and any one of F 4 to F 6 is hydrogen, and the remaining two are both methyl, respectively, ii) when C 1 and C 2 are both oxygen, any one of F 1 to F 3 and any one of F 4 to F 6 are absent, and the remaining two are linked together to form a tetrahydrofuran ring by comprising the oxygen, respectively. wherein, in Formula 1, M is a Group 4 transition metal of Ti, Zr, Hf, or Rf; each of X 1 and X 2 is independently halogen, C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkynyl, C 6-20 aryl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 1-20 alkylamido, C 6-20 arylamido, or C 1-20 alkylidene; R 3 and R 4 is independently hydrogen, substituted or unsubstituted C 1-20 alkyl, substituted or unsubstituted C 2-20 alkenyl, substituted or unsubstituted C 2-20 alkynyl, substituted or unsubstituted C 6-20 aryl, substituted or unsubstituted C 7-40 alkylaryl, substituted or unsubstituted C 7-40 arylalkyl, or substituted or unsubstituted C 1-20 silyl, and R 1 and R 2, and R 5 and R 6 are linked together to form a substituted or unsubstituted six-membered ring, wherein the ring members consist of five carbon atoms and one nitrogen atom, and these ring-forming carbon atoms comprised in R 1, R 2, R 5 and R 6 are saturated, wherein each substituent is independently halogen, C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkynyl, C 6-20 aryl, C 7-40 alkylaryl, C 7-40 arylalkyl, C 1-20 alkylamido, C 6-20 arylamido, or C 1-20 alkylidene; C1 and C2 are both nitrogen or both oxygen; wherein: i) when C 1 and C 2 are both nitrogen, any one of F 1 to F 3 is hydrogen and any one of F 4 to F 6 is hydrogen, and the remaining two are both methyl, respectively, ii) when C 1 and C 2 are both oxygen, any one of F 1 to F 3 and any one of F 4 to F 6 are absent, and the remaining two are linked together to form a tetrahydrofuran ring by comprising the oxygen, respectively. i) when C 1 and C 2 are both nitrogen, any one of F 1 to F 3 is hydrogen and any one of F 4 to F 6 is hydrogen, and the remaining two are both methyl, respectively, ii) when C 1 and C 2 are both oxygen, any one of F 1 to F 3 and any one of F 4 to F 6 are absent, and the remaining two are linked together to form a tetrahydrofuran ring by comprising the oxygen, respectively.