My Red String of Fate

Red strings are the signs of death. These strings attach to the body will attack the person's somatic function until they die. However, this should just be a setting in a novel! I somehow transmigrated into the body of a supporting character with the sole skill of removing the red strings. One day, I saved a man on the street and he turned out to be the angel of death - a stand-by lover of the female lead in the novel! Weirdly, there is a red string connecting the two of us...