Inclusion criteria:

1. Age ≥19 years
2. De novo coronary lesions eligible for drug-eluting stent implantation
3. Medina 1,1,1 or 1,0,1 or 0,1,1 de novo bifurcation lesions (LM or non-LM) and those of main vessel or side branch can be covered by 2 stents
4. Reference vessel diameter of side branch ≥2.5 mm by visual estimation

Exclusion criteria

1. Current or potential pregnancy
2. Inability to follow the patient over the period of 1 year after enrollment, as assessed by the investigator
3. Subjects with ST elevation myocardial infarction <24 h from the onset of chest pain
4. Cardiogenic Shock

History of severe allergic reactions to study medication Currently pregnant or breastfeeding Recent participation in another clinical trial within the last 30 days Presence of uncontrolled medical conditions that could affect safety