The primary objective of the POST-PCI trial is to compare the clinical outcomes of a post-percutaneous coronary intervention(PCI) aggressive management strategy of routine noninvasive functional testing to a usual-care strategy of symptom-oriented functional testing in patients with high risk clinical, anatomical, and procedural characteristics who received PCI with contemporary drug-eluting stent and bioresorbable vascular scaffold.

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.