Not All Heroes From Earth Are Bad - Chapter 83

“A marriage contract determines fate for a lifetime.As the once well-to-do Sang Wan marries into the wealthiest Shi family of Qingzhou, she faces a suspicious and difficult mother-in-law, a husband who cherishes his childhood sweetheart instead, a harsh eldest sister-in-law, and a cunning younger sister-in-law. The diffident Sang Wan retreats and concedes until she ultimately meets a tragic and desolate end, dying alone in a secluded corner of the Shi Mansion.Reborn in the sedan chair on her wedding day, where should she go? At the starting point of tragedy, with a chance to start anew, can she change her tragic fate and create a life filled with harmonious melodies for herself?In this life, she only desires a leisurely and peaceful existence, to truly live for once.”

One day, Zhang Fan, a poor medical student, receives a medical system from the future. This turns him into a new shining star in the medical field. Along the way, he must face medical corruption, competition, and infighting from other doctors, and even find time for a love life as he strives for the top of the medical field!

- Description from Novelupdates

On the day of her escape from prison, she had died unexpectedly and was reborn into the body of Madam Huo.

I became the childhood friend of the protagonist in a novel. The childhood friend who died from taking drugs.