On the night of August 10, 2015, in the best foreign-funded hospital and the best single ward in R City, Qin Yu had just put his four-year-old daughter to sleep. At this time, he was sitting in front of the hospital bed, watching his daughter sleep in a daze.

The little doll-like girl on the hospital bed suffers from severe tetralogy of Fallot, a congenital heart malformation. In order to get the best treatment for his daughter, Qin Yu paid an unimaginable price.

Today is the third day after the operation, and the girl is out of danger. Life seemed to be developing in a good direction, but Qin Yu's heart felt more and more uneasy.

"Bell, Dad has done so much for you, you must get better soon!" He stroked his daughter's hair, and his eyes moistened unconsciously. He looked up and tried desperately to hold back the swirling tears, but in the blink of an eye, the hot tears still slid down his cheeks and dripped onto the white sheets.

The girl seemed to sense her father's sadness, and turned over at the right time, and let out a soft dream cry from her mouth, "Daddy......"

Qin Yu was so frightened that he quickly wiped the tears from his face, he couldn't let his daughter see his weakness.

Even if he did something wrong, even if he had to be punished, even if he had to bear great pain in his heart, he had to bear everything alone.

What the future holds, he doesn't know. His wish is simple: his daughter will no longer be afflicted by illness, and his wife will no longer worry about her health. He has made his choice, and the rest is left to fate.

Soon after Qin Yu left, a young nurse on duty came in to make rounds. The little girl was sleeping soundly, as if the sorrows and illnesses of the world had never befallen her.

The nurse approached the bed, ready to do some basic tests for the girl. At this moment, she found a crumpled piece of paper next to the bed, and picked it up to see that it turned out to be a girl's medical examination report.

It must have been accidentally dropped by the girl's father, the nurse thought, and neatly folded the paper and placed it at the head of the girl's bed.

Suddenly, she caught a glimpse of a set of coordinates recorded on the back of the paper: 27°30′37"N, 102°18′23"E. She pondered for a moment, having no idea where the coordinates were pointed.

At that time, the nurse did not know that somewhere hundreds of kilometers away, a huge conspiracy had been quietly brewing for a long time. She wouldn't have known that this set of mysterious coordinates would become the only clue for the police to solve the case more than ten days later.