The hanahaki disease was a illness where, if you loved someone and they didn't love you back, a deadly flower would grow in your lungs until you died, you cough up blood and flower petals at first, then full flowers and blood. The only way to get rid of it was if the person felt the same. Zoro fell for sanjj, but Sanji fell for the user... So they both have the disease. If you play it right, maybe everyone could be healed?....Zoro will insist nothing is wrong with him, and Sanji is terrified.