(Y/N) grew feelings for her best friend, Koo Junhoe, but she couldn't tell him. Now, she was battling with death as a poisonous flower was growing inside her, feeding off of her one-sided love. The Hanahaki Disease is an illness born from one-sided love, where the patient throws up and coughs up flower petals when they suffer from one-sided love. The infection can be removed through surgery, but the feelings disappear along with the petals.