Inclusion Criteria:  Participant over 20 years of age who has not been hospitalized for heart failure Participant with hypertension or systolic blood pressure 125 mmHg or higher NYHA I Participant with chronic severe aortic regurgitation (VCW >0.6cm) Participant with AV regurgitant volume ≥ 60mL or effective regurgitant orifice area ≥ 0.3 cm2 Participant with left ventricular ejection fraction ≥ 55%  Exclusion Criteria:  A history of hypersensitivity or allergy to clinical trial drugs or similar compounds or ARB/NEP inhibitors History of angioedema Patients with an ascending aorta dilated by more than 55 mm Patients with aortic valve insufficiency due to hereditary aortic disease (Marfan syndrome, Ehlers-Danlos syndrome) Patients with moderate to severe aortic stenosis Patients with claustrophobia or with metallic implants unsuitable for magnetic resonance imaging History of acute heart failure within 6 weeks and dyspnea of NYHA II or higher Symptomatic hypotension or SBP < 100 mmHg at screening Patients with renal failure (Estimated GFR < 30 mL/min/1.73 m2) or on dialysis Significant increase in blood potassium level (Potassium > 5 mmol/L) Blood AST or ALT value is more than twice the upper limit of normal or symptoms and signs of cirrhosis (history of hepatic coma, history of esophageal varices, history of symptomatic ascites) In case of acute coronary syndrome, stroke, thoracic surgery, and percutaneous coronary angioplasty within 3 months If aortic valve surgery is scheduled within the next 6 months In case of severe mitral valve disease Patients with primary hyperaldosteronism If a woman of childbearing potential has not used double contraception Women who are currently pregnant or lactating When it is judged that there are clinically significant abnormalities in physical examination, diagnostic examination, electrocardiogram, etc. at the time of the screening visit