Chanyeol found a letter inside gift from his fan, written that the fan diagnosed with brain cancer and wanted to marry him as her last wish.   ForewordCast : Park Chan yeolThe rapper of popular korean idol group, EXO. Hes known as talented idol with gentle personality. He meets with Chaeyoung and later receives letter from her. Park Chae youngA 20 years old girl, currently studies at Ehwa Woman University. She never liked exo before, until she met Chanyeol in person and fell in love at the first sight. Unfortunately, then she diagnosed with brain cancer which change her life. Jeon Jung kookChaeyoungs bestfriend. They lived at the same house along with Lisa, their other friend. Jungkook actually liked Chaeyoung but he dont know how to show his true feeling