Pragmatic Trial Comparing Symptom-Oriented Versus Routine Stress Testing in High-Risk Patients Undergoing Percutaneous Coronary Intervention

Inclusion Criteria: 1. Subject was \> 19 years of age. 2. Subjects who underwent successful percutaneous coronary intervention with contemporary drug eluting stent, contemporary Bioresorbable Scaffold or drug eluting balloon at In-stent restenosis (ISR) lesion. 3. Patients must have at least one of the following high-risk clinical, lesion, or procedure-related risk factors. 3-1. Clinical factors; diabetes, renal insufficiency/failure, enzyme positive acute coronary syndrome (ACS) (STEMI or NSTEMI). 3-2. Lesion- or procedure-related factors ; left main lesion, bifurcation lesion, ostial lesion, chronic total occlusion lesion, multivessel disease (≥ 2 vessels stented), restenotic lesion, diffuse long lesion (lesion length ≥30 mm or stent length ≥32 mm), or vein bypass graft stented 4. The patient or guardian agrees to the study protocol and the schedule of clinical follow-up, and provides informed, written consent, as approved by the appropriate Institutional Review Board/Ethical Committee of the respective clinical site. Exclusion Criteria: 1. Cardiogenic shock at the index admission 2. Subject treated with only bare metal stent or balloon angioplasty during the index procedure. 3. Pregnant and/or lactating women. 4. Concurrent medical condition with a life expectancy of less than 1 years 5. Patients who are actively participating in another drug or device investigational study, which have not completed the primary endpoint follow-up period. 6 Subject was unable to provide written informed consent or participate in long-term follow-up.