Luhan was an orphan since the age of ten. His parents died of a disease; a strange disease, and doctors called it the "Demon's Disease". The cure to this disease had yet to be discovered and the symptoms of the disease was debilitating. Luhan had inherited the disease from his parents and it had only began to embark on him when he was in the middle of his high school education. He used to be a model student in Seoul Arts High where he excelled in both vocal and dance skills. Many wondered he might have a bright future ahead but unfortunately, the disease embarked on him. After knowing about the illness, he changed. His girlfriend, Seohyun, was kept in the dark. Will she forsake me if i tell her? This question had been evolving around in his head. After Seohyun know about Luhan's condition, will she stay with him and go through the thick and thins in his life? Or, will she turn her back on him and become a total stranger? What difficulties do they exactly face which can cause them to fall apart? The truth unveils in Strange and a Stranger...