Yunhye had a cancer and she never tells that to Luhan. She then broke him up because she doesn't want him to be hurt. After her death, Luhan still like her and he decided to look for her. Then, one day, he met with Yunhee (Yunhye's younger twin) and he thought it was her because Yunhye never tell him that she had a twin. Starting that day, a lot of things happen...