Eorin shinbu (2004)

The only thing sixteen year-old Seo Bo-Eun's grandfather wants is to see her wed, even going as far as to fake a fatal illness to get his way. He arranges her marriage to twenty-something Park Sang-Min, the grandson of a family friend. Keeping their marriage a secret from all but a select few, the newlyweds try to live their separate lives as normally as possible, but it becomes far more complicated than they ever imagined...