Have you ever been waiting for someone you've met and missed with no reasons? On Cloud Nine tells the story of love and relationship between Tiew and Mork. Tiew promises to wait for Mork at Chiang Mai where they first met. Mork comes back to Chiang Mai with different feelings for Tiew. Will Mork go back to Tiew to continue their unforgettable memories? Will they be on cloud nine?