Lin Qingyin, a good-for-nothing medical girl who was judged by mainstream medical clinics as "deviant". What she has learned throughout her life is approximately zero in this world of martial arts that emphasizes internal healing and miraculous medicines. Until that day, she went out to collect herbs and picked up a handsome man who was outraged by both humans and gods, but who was also about to die. Out of a doctor's instinct and a little bit of face control, she saved the person. As soon as she opened her eyes, the man lazily wiped the blood from the corner of his mouth and told her that they "lived and died together." He is the legendary demon king who kills without blinking an eye, and he is seriously injured and on the verge of death. And she is his new "lifeblood" - when he dies, she dies. Lin Qingyin: "..." I am just a weak, pitiful and helpless doctor! In order to save her own life, she had no choice but to take out all the modern medical knowledge hidden in the bottom of the box. Demon Lord's meridians are broken? It's okay, I'll perform a "vascular nerve bypass surgery" on you. Is the Demon King's internal energy disordered? Don't be afraid, I will use "physical therapy" combined with "rehabilitation training" to help you rebuild your circulation. Craniotomy, suturing, bone setting, debridement... Lin Qingyin was on the verge of collapse every day, and the knife in her hand was busier than the demon king's sword. Everyone in the demon sect was scared to death when they saw their lord being tied to a wooden board and doing "stretching exercises", being stuck with silver needles all over his body, and having to drink strange soups and medicines: "Demon girl! What did you do to your lord!" Lin Qingyin was about to cry but had no tears: I am saving him, and I am also saving me! Little did she know that the Demon Lord, who was enjoying the "sweet torture", would secretly dissipate the newly recovered inner strength every time under her focused eyes, and thought with satisfaction: