A compound of Formula 1 or pharmaceutically acceptable salt thereof: wherein, A is a bond, -CH 2 -, -O-, or -C(CH 3) 2 -, L is -(CH 2) m -O-, -(CH 2) n -NH-, -CH(CH 3)-NH-, or -N(CH 3)-, m is 1 or 2, n is 0, 1, or 2, Ar is an aromatic ring selected from the group consisting of phenyl, phenoxyphenyl, pyridinyl-phenyl, indazolyl-phenyl, morpholinyl-phenyl, piperazinyl-phenyl, piperidinyl-phenyl, pyrazolyl-phenyl, benzyl-phenyl, phenylaminophenyl, biphenyl, piperazinyl-biphenyl, morpholinyl-biphenyl, naphthyl, benzodioxolyl, furanyl, indazolyl, quinoxalinyl, and indanyl, and the aromatic ring is optionally substituted with one to three susbsituents selected from the group consisting of halogen, cyano, hydroxy, trifluoromethyl, C 1 ~C 4 alkyl, C 3 ~C 6 cycloalkyl, C 1 ~C 4 alkoxy, hydroxy-C 1 ~C 4 alkyl, C 1 ~C 4 alkoxy-C 1 ~C 4 alkyl, hydroxycarbonyl-C 1 ~C 4 alkyl, C 1 ~C 4 alkoxycarbonyl-C 1 ~C 4 alkyl, C 1 ~C 4 alkoxy-C 1 ~C 4 alkoxy-C 1 ~C 4 alkyl, C 1 ~C 4 alkylcarbonylamino-C 1 ~C 4 alkyl, amino-C 1 ~C 4 alkoxy, mono- or di-C 1 ~C 4 alkylamino-C 1 ~C 4 alkoxy, aminosulfonyl, C 1 ~C 4 alkyl-sulfonyl, trifluoromethylsulfonyl, C 3 ~C 6 cycloalkylaminosulfonyl, mono- or di-C 1 ~C 4 alkylamino, C 1 ~C 4 alkylcarbonylamino, methanesulfonylamino, C 1 ~C 4 alkylcarbonyl, hydroxycarbonyl, mono- or di-C 1 ~C 4 alkylaminocarbonyl, oxolanyl-C 1 ~C 4 alkylaminocarbonyl, di-C 1 ~C 4 alkylamino-C 1 ~C 4 alkylaminocarbonyl, imidazolyl-C 1 ~C 4 alkylaminocarbonyl, C 1 ~C 4 alkoxy-C 1 ~C 4 alkylaminocarbonyl, C 3 ~C 6 cycloalkylaminocarbonyl, pyrrolidinylcarbonyl, triazolyl-C 1 ~C 4 alkylaminocarbonyl, C 1 ~C 4 alkoxycarbonyl-C 2 ~C 4 alkynyl, hydroxycarbonyl-C 2 ~C 4 alkynyl, hydroxy-C 1 ~C 4 alkylphenyl-C 2 ~C 4 alkynyl, and C 1 ~C 4 alkoxy-C 1 ~C 4 alkyl-phenoxymethyl. A is a bond, -CH 2 -, -O-, or -C(CH 3) 2 -, L is -(CH 2) m -O-, -(CH 2) n -NH-, -CH(CH 3)-NH-, or -N(CH 3)-, m is 1 or 2, n is 0, 1, or 2, Ar is an aromatic ring selected from the group consisting of phenyl, phenoxyphenyl, pyridinyl-phenyl, indazolyl-phenyl, morpholinyl-phenyl, piperazinyl-phenyl, piperidinyl-phenyl, pyrazolyl-phenyl, benzyl-phenyl, phenylaminophenyl, biphenyl, piperazinyl-biphenyl, morpholinyl-biphenyl, naphthyl, benzodioxolyl, furanyl, indazolyl, quinoxalinyl, and indanyl, and the aromatic ring is optionally substituted with one to three susbsituents selected from the group consisting of halogen, cyano, hydroxy, trifluoromethyl, C 1 ~C 4 alkyl, C 3 ~C 6 cycloalkyl, C 1 ~C 4 alkoxy, hydroxy-C 1 ~C 4 alkyl, C 1 ~C 4 alkoxy-C 1 ~C 4 alkyl, hydroxycarbonyl-C 1 ~C 4 alkyl, C 1 ~C 4 alkoxycarbonyl-C 1 ~C 4 alkyl, C 1 ~C 4 alkoxy-C 1 ~C 4 alkoxy-C 1 ~C 4 alkyl, C 1 ~C 4 alkylcarbonylamino-C 1 ~C 4 alkyl, amino-C 1 ~C 4 alkoxy, mono- or di-C 1 ~C 4 alkylamino-C 1 ~C 4 alkoxy, aminosulfonyl, C 1 ~C 4 alkyl-sulfonyl, trifluoromethylsulfonyl, C 3 ~C 6 cycloalkylaminosulfonyl, mono- or di-C 1 ~C 4 alkylamino, C 1 ~C 4 alkylcarbonylamino, methanesulfonylamino, C 1 ~C 4 alkylcarbonyl, hydroxycarbonyl, mono- or di-C 1 ~C 4 alkylaminocarbonyl, oxolanyl-C 1 ~C 4 alkylaminocarbonyl, di-C 1 ~C 4 alkylamino-C 1 ~C 4 alkylaminocarbonyl, imidazolyl-C 1 ~C 4 alkylaminocarbonyl, C 1 ~C 4 alkoxy-C 1 ~C 4 alkylaminocarbonyl, C 3 ~C 6 cycloalkylaminocarbonyl, pyrrolidinylcarbonyl, triazolyl-C 1 ~C 4 alkylaminocarbonyl, C 1 ~C 4 alkoxycarbonyl-C 2 ~C 4 alkynyl, hydroxycarbonyl-C 2 ~C 4 alkynyl, hydroxy-C 1 ~C 4 alkylphenyl-C 2 ~C 4 alkynyl, and C 1 ~C 4 alkoxy-C 1 ~C 4 alkyl-phenoxymethyl.