The goal of this clinical trial is to learn the effect of low level tragus stimulation (LLTS) on heart rate variability (HRV), neutrophil-lymphocyte ratio, and major adverse cardiovascular events in patient with ST-segment Elevation Myocardial Infarction (STEMI). It will also learn about the safety of LLTS in such setting. The main questions, it aims to answer are compared with sham control: 1. Does LLTS could alter low frequency/high frequency ratio in patients with STEMI? 2. Does LLTS could alter neutrophil-lymphocyte ratio in patients with STEMI? 3. Does LLTS could decrease mortality in patients with STEMI? 4. Does LLTS could decrease reinfarction event in patients with STEMI? 5. Does LLTS could decrease stroke event in patients with STEMI? 6. Does LLTS could decrease lethal arrhythmia event in patients with STEMI? 7. Does LLTS could decrease acute lung oedema event in patients with STEMI? 8. Does LLTS could decrease cardiogenic shock event in patients with STEMI? Researchers will compare LLTS to sham LLTS control to see if LLTS have benefit in participants with STEMI participants will divided into two group i.e. treatment group vs control (sham/placebo) group, then both of them: 1. Undergo laboratory examination before Primary Percutaneous Coronary Intervention (PPCI) 2. Undergo HRV measurement using WeCardio device before Primary Percutaneous Coronary Intervention (PPCI) 3. Undergo LLTS (treatment group will have stimulation) for 60 minutes, however, sham control will not have stimulation, before PPCI 4. Undergo PPCI 5. Undergo laboratory examination after Primary Percutaneous Coronary Intervention (PPCI) 6. Undergo HRV measurement using WeCardio device after Primary Percutaneous Coronary Intervention (PPCI)