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. Keith has Hanahaki disease. He thought it was impossible, but it isn't. He knows why. Ever since Lance had left voltron to join the galra because he felt he wasn't needed in voltron anymore Keith had been upset. He's horrible at ignoring his feelings and now that he's trying to forget it's all coming back. He's in love with Lance. The feelings can't be ignored. The flowers in his lungs won't let him be. He has to choose to except them, or die a horrible death.