Because he accidentally fell into a well and traveled through time and space, he applied for a job as a "valet" for his own future. On the road, she met an old man who told Ziyun that she would meet someone with the same birthmark as her in the city - her destined person!
The three male protagonists all like Ziyun, so who is Ziyun's destined person? ... Is Ziyun's fate really what the old man said?