A butterfly in the Amazon rainforest in South America, flapping its wings occasionally, may cause a tornado in Texas two weeks later.
Some people took the ordinary school legends seriously, while others believed them to be true. Yunyun just tossed a coin into the past as a joke and made a wish to go back to the past. But when she really realized her wish to go back to the past, the classmate who was a young genius died early, the classmate who hated her so much, the warm boy she had a crush on but missed when she was young... How will she face the choice?
What is given by fate must be a gift, but what has been changed can still be called fate.
Intention: I thought I had avoided my original fate, but I just found another way to return to the original track.