Repay You with My Life

[Cool-headed assassin top × sickly young master bottom] Historical romance with angst | Older man/younger man | Mutual salvation | Happy ending

On the day he took a medicinal bath to prolong his life, the young master saved an assassin covered in blood.

Later, the assassin said, “You nurse me back to health, and I’ll take care of you.”

Later still, he said, “I’ll spend the rest of my life repaying what I owe you.”