Jeong Yoojin is your regular "Little Miss Tardy" who too often finds herself in trouble for her lateness. Today seems no different and once again it is another rush to school for Yoojin with her childhood friend; Kim Sanghyeok. Unbeknownst to her, this day is different. Fate intervenes as she makes the acquaintance of a mysterious new student.

Kang Joonsang and Yoojin's love begins to blossom as they keep on running into each other. In the meantime, Joonsang becomes confused and shocked to find the same picture he has at Yoojin's house.

Yoojin waits for Joonsang until late at night, but he never appears. The next day, she hears the shocking news that Joonsang was killed in a car accident. Ten years later, Yoojin is engaged to Sanghyeok. She meets her friend Oh Chaerin's boyfriend Lee Minhyeong, who looks just like Joonsang.

Yoojin and Minhyeong work together in renovating a ski resort. Although Yoojin tries to hide that she's working with Minhyeong, Sanghyeok soon finds out.

Sanghyeok is unhappy that Yoojin is working with Minhyeong but realizes that he cannot make her quit the work. When Chaerin finds out that Yoojin and her boyfriend work together, she feels threatened and makes up lies about her to Minhyeong.