1. Main objective Among patients with elevated Lp(a) levels (\>30mg/dL) who did not experience cardiovascular events or BARC type 2, 3, or 5 bleeding within 12 months after PCI and DES implantation, was it possible to reduce the primary adverse cardiovascular and cerebrovascular events (a composite endpoint consisting of all-cause death, non-fatal myocardial infarction, and stroke) by extending the duration of DAPT (24 months) compared to the standard duration (12 months)? (Efficacy test) 2. Secondary Objectives Key secondary research objective: Among patients with elevated Lp(a) levels (\> 30mg/dL) who underwent PCI and received DES implantation within 12 months after the procedure, and who did not experience cardiovascular events or BARC type 2, 3, or 5 bleeding, whether extending the DAPT duration (24 months) compared to the standard DAPT duration (12 months) does not result in an increase in clinical net adverse events (a composite endpoint consisting of all-cause death, non-fatal myocardial infarction, stroke, and BARC type 3 or 5 bleeding) compared to the standard DAPT duration. (Non-inferiority test) Other secondary research objectives: To evaluate the differences in the incidence of the composite endpoint consisting of BARC type 3 or 5 bleeding (the primary safety endpoint) between extending the DAPT duration (24 months) and the standard DAPT duration (12 months); the differences in the incidence of the composite endpoint consisting of cardiovascular death and myocardial infarction; the differences in the incidence of the composite endpoint consisting of all-cause death and myocardial infarction; the differences in the incidence of stent thrombosis; the differences in the incidence of any myocardial infarction; the differences in the incidence of target vessel myocardial infarction; the differences in the incidence of stroke; the differences in the incidence of ischemic stroke; the differences in the incidence of hemorrhagic stroke; the differences in the incidence of cardiovascular death; the differences in the incidence of all-cause death; the differences in the incidence of repeat revascularization; the differences in the incidence of target vessel revascularization; the differences in the incidence of BARC type 2, 3, or 5 bleeding; the differences in the incidence of any bleeding.