The Romantic Century - Love Without Boundaries

This is about a girl having an ambition of being an international opera singer in the future, who had made a childhood promise that she wouldn't marry, but she broke her promise of not making a boyfriend twice in her high school time, then something suddenly came to her mind that she should choose her childhood promise over her second and last boyfriend, who she had been in a relationship with for about twelve years as of the time that she and her boyfriend was about to get married, so she asked the girl who her boyfriend had had an ultimate crush on in twelfth grade to substitute her as her boyfriend's bride as she didn't want him to be lonely for the rest of his life just because of her decision, however, they eventually got married to each other at an old age after his wife died of ovarian cancer when they unexpectedly met each other at a nursing home.