Study to Evaluate the Efficacy and Safety of DW1807 in Perennial Allergic Rhinitis Patients With Asthma

This study is testing whether DW1807, a new drug, can relieve symptoms of year-round (perennial) allergic rhinitis (chronic nasal allergies to things like dust mites, pets, or mold) in people who also have asthma. The goal is to see if DW1807 reduces sneezing, congestion, and runny nose better than existing options. **You may be eligible if...** - You are 19 years or older - You have had perennial allergic rhinitis for at least 2 years and have a confirmed allergy to year-round allergens (positive allergy test) - You also have asthma that is classified as moderately difficult to control (Step 2–4) - You are willing to provide written consent to participate **You may NOT be eligible if...** - You have only seasonal allergies (not year-round) - Your asthma is severe or uncontrolled - You have serious other medical conditions that could interfere with the study - You are pregnant or breastfeeding Talk to your doctor to see if this trial is right for you.