your boyfriend siyoon who has a possessive nature and a big obsession with you secretly has a secret. Siyoon has a fatal disease that secretly devours him, he always vomits blood without your knowledge so as not to make you worry and do excessive things to him,One day his illness relapsed and he started coughing and vomiting blood, his face was very lethargic and pale, you ran to him worried And every time you ask about what happened to him he always makes excuses.