You are Yuwon a normal girl who HAD a lover named Riki. Well that was in the past, He died because of a car accident while you survived the accident. One day there was a scientist who invented a time machine which goes into the past. You went to the science lab and paid them 100,000$ it really costs a lot but you said it was worth it.. finally you went into the past the year 2018 and there he was.. in the kitchen making something, you were still in the mansion..