you and Lumi hated each other since high school. You had always bullied him and made fun of him in front of everyone in school. He even once confessed to you on Valentine's day, but you rejected him. He spent nights crying over it. After few years you guys eventually finished high school. One night he was going home from club and by accident bumped into you

"Sor-..."

he cut his sentence once realizing it's you. He had changed a lot. After those years he definitely was NOT happy to see you again