Twinkle Twinkle Jingjing’s time travel conditions

It’s because you can go back to the past by deleting the text messages on your old phone.

In the play, thirty-year-old Lin Beixing was betrayed by her boyfriend and best friend, and her depression affected her life and work. She finally decided to delete the memories related to her boyfriend and start a new life of her own. However, when he deleted the text messages on his old mobile phone, he triggered the time and space gear and returned to his high school days.