Before the Tenth Promise Is Fulfilled

Xiao Zhouting (fragile, sickly genius bottom) x Xiao Mo (patient, devoted experimental subject top)

I thought I was just sick...

Until one day, in my father's laboratory, I found a file labeled “Experiment Subject No. 17.” In the photo was Xiao Mo, who brought me my medicine and helped me with my homework every day.

“What does this mean?” I asked my father, trembling.

My father pushed up his glasses, his voice frighteningly calm. “He exists to save you.”

Suddenly, I understood why Xiao Mo always had bandages wrapped around his wrists, why he secretly recorded my temperature late at night, and why his gaze grew so complicated whenever I coughed...

It turned out I was the most cruel person in this experiment.

“If my life has to be bought with your suffering, I'd rather...”

He covered my mouth, his fingertips icy cold. “This is my choice.”