 The patients who have intermediate CAD 30-80 diameter stenosis by visual estimation with FFR0.80, or nonculprit coronary artery disease with FFR0.8 after culprit coronary artery disease intervention will be enrolled. FFR, IVUSoptional and index of microcirculatory resistance IMR should be performed simultaneously. Atorvastatin 20mg is a starting dose, then up-titration will be done twice within each 46weeks until LDL target goal 1 LDL70mgdl, or 2 statin naive: 50 reduction from baseline LDL, current statin user: 30 reduction from baseline LDL. First titration will be atorvastatin 40mg, second will be atorvastatin 80mg. If patients have any adverse effect on atorvastatin, the dose of atorvastatin can be adjusted by investigators decision. Official clinical follow-up except visit for statin dose titration will occur at 1, 12 months after index procedure. Follow-up coronary angiography, FFR,IMR,and IVUSoptional will be performed 12 months after index procedure. 