I don't know why I randomly stumbled back to this, but what if it was Empire of Gold? The drama format is sort of consistent with your description, although I wouldn't say that there are a lot of flash forwards.
Empire of Gold spans through two decades and follows the life of the Choi family and Jang Tae Joo, an outsider. They basically spend the entire drama fighting over for control of Sung Jin Group, the company that the Choi family started.
It mainly revolves around Choi Seo Yoon, the main girl, who ends up inheriting the company from her father, because he realized all his other children weren't as good as her, Seo Yoon's cousin, Choi Min Jae, who feels that he deserves the company because of a variety of reasona, and Jang Tae Joo, who wants control of the company. I think Javabeans did an intro to the drama post, not an ending recap.
A lot happens in Empire of Gold, most notably, Choi Seo Yoon and Jang Tae Joo get married so that they can at first defeat Choi Min Jae and prevent him for having the group and then fight among themselves for the company after Min Jae oppa has been defeated.
Maybe that was the one?
EDIT: It isn't Who Are You?, Two Weeks, or Mirae's Choice for sure, right?
Edited by xxdevilishxx - 11 years ago