What's the story of the invisible time crack in ta movie plot?

1, everyone's mobile phone has an invisible mobile phone person guarding you. Jiao Xiao (Junyan Jiao), a magazine photographer who has been lovelorn for two years, is immersed in the shadow of the past, and her work and life are in a mess. Yifeng Li is her master's first guardian, and often helps her solve all kinds of small things in life. Until one day, drunk Jiao Xiao almost collapsed. In desperation, Yifeng Li saved her and found that the other party could see herself. Feng followed Jiao home as usual. Jiao thought he was a stalker and had to lie to his neighbors.

2. Later, Jiao went to Taiwan Province Province to shoot. It was sad to break up with my boyfriend. Because she stood me up, her boyfriend met another girl before waiting for him, and then broke up.

3. Feng appeared again, and they played and chatted together. Feng gradually focused on his feelings and found his thoughts and regrets for his ex-boyfriend. Feng told Jiao that he could take her through time and space and change the past. Jiao Huan happily promised to go through everything when she got back, only to find that she would still quarrel and break up together, and could not stop the outcome of a third party. They're not meant to be together. At this time, Jiao traveled back to reality and realized that it was impossible for him and his ex-boyfriend. Only then did he find that Feng had disappeared in front of him because he violated the regulations of mobile phone men. Feng took a photo of his master's last tears.