Don't wait for me

Yujeong makes a wish and goes back to the past, but once she gets there, high schooler Kang Taehyun, who looks like a Choco Pie mushroom snack, likes her. Yujeong is so happy about that, but then suddenly she goes back to her original life for several years... When she goes to meet Kang Taehyun again, the Choco Pie mushroom snack Taehyun is nowhere to be seen, and only a regretful, obsessive man who longs for her remains,,,