Surely Tomorrow follows the intertwined lives of Lee Kyeong-do (Park Seo-jun) and Seo Ji-woo (Won Ji-an). The pair first fell in love in their early twenties, only to part ways. They reunited in their late twenties and gave romance another chance, but once again went their separate paths. Years later, fate brings them together unexpectedly—Kyeong-do, now a journalist covering a sensational scandal, and Ji-woo, the wife of the man at the center of it. Against the backdrop of public scrutiny and personal history, their story unfolds into a surprising third chapter.