Time(2007)

Attractive Seh-hee is having problems with her boyfriend, Ji-woo. After two years, their love has entered a period of weariness. Though faithful to his fiancée, Ji-woo eyes other women and, in bed, seems to get excited only at the thought of making love to other partners. Seh-hee can't cope with the mounting jealousy tainting her life and decides to dramatically change her look--to become a new woman, with whom her boyfriend can again fall in love. She enters a plastic-surgery clinic and then vanishes for six months-- long enough for the scars to heal--leaving Ji-woo hurt and confused by her disappearance. Resurfacing as the new waitress at the coffee shop Ji-woo frequents, Seh-hee--now calling herself See-hee--tries to seduce him. But between them stands the specter of Ji-woo's lost girlfriend, with whom he is still very much in love. Jealousy once again creeps into the shaky existence Seh-hee has artificially crafted.