Hanahaki Disease is an illness born from one-sided love, where the patient throws up and coughs of flower petals when they suffer from one-sided love. The infection can be removed through surgery, but the feelings disappear along with the petals. Woozi has the Hanahaki Disease. He just got it and is puzzled as to why he has it. Then he sees a Seungcheol being all sweet and well, Seungcheol, he feels the urge to puke more petals. His petals were all blue. No other colours only blue.