时宜（白昕怡 饰）和夏禾（王钧浩 饰）是青梅竹马的好友与玩伴，在高中毕业之后，本来可能走到一起的两人，在机缘巧合的指引之下走上了两条完全不同的道路，从此，他们渐渐中断了联系。之后，两人都结了婚成了家，但是他们的婚姻都不幸福。 某日，一场意外将他们双双带回了2008年，两人就此重逢了。相似的遭遇快速的拉近了两人之间的距离，这段未尽的缘分终于有了能够施展的机会。就在两颗心慢慢靠近的这个节骨眼上，时宜家暴的丈夫和夏禾出轨的妻子竟然也穿越到了这个时空中，四人之间展开了一场令人啼笑皆非的较量。
On Fran and Maxwell's honeymoon aboard the yacht, Fran falls overboard and Maxwell jumps in to rescue her. They manage to make it to a deserted island. There, they have some good times and bad times in their survival, but the worst ends up being a poisonous bite that Maxwell receives. He thinks he's going to die, but luckily for him, Fran watched daytime television in the past which gave her the necessary skills to tend to his illness. Meanwhile, they are noticed missing when the yacht docked at its first port without them. The Sheffield kids, Sylvia and Niles fear the worst. After a week of the Coast Guard not being able to locate any sign of Fran and Maxwell dead or alive, C.C. decides to take matters into her own hands.
所谓时代创造英雄，英雄创造时代。该剧以赖天佑父女，林通海父子，黄昆山父女和王胜天，王胜志兄弟为故事主要人物线索，表现了两代四家人在商场竞争中的社会价值，人情义理，亲情，友情，爱情和人性的真善丑恶......创下央视引进剧最长纪录的台湾长剧《意难忘》共有526集，目前央视引进了前168集。《意难忘》采取了“边播边拍”的方式，该剧导演王为表示，“我和制作人每天晚上一起看节目的播出，并随时因收视率的高低调整情节，以机动方式来调整剧情走向，为的是创造高收视率。
