Lu Fan Fan is Liu Ruo Chen's personal nutritionist. She fell in love with him after many years of getting along. When Lu Fan Fan confessed her love to him, she was rejected. Three months later, she resigned as Liu Ruo Chen's nutritionist and began to live alone at her new house. One day, Lu Fan Fan accidentally fell asleep in the toilet and she actually traveled back 12 years ago and met Liu Ruo Chen when he was 20 years old. Adapted from the novel Ping Xing Lian Ai Shi Cha (平行恋爱时差) by Su Yi Shan.