When you’re in love, rain can be sweet like flowing emotions, or it can be bittersweet if it reminds you of the love that got away. While in college in the 1970s, Seo In Ha falls in love with the sweet Kim Yoon Hee. But destiny stepped in and separated them, and both moved on with their lives. Forty years later, In Ha’s son meets and falls in love with Yoon Hee’s daughter. Can the young couple finish what their parents started or will fate step in again to separate two generations of lovers?