I Rule the Cultivation World with a Coffin

-- Sha Zhou was a modern-day Celestial Master. She transmigrated after an accident while putting her master's bronze corpse into a coffin. She got a death sentence from the start: someone attacked her from behind and shoved her into the middle of the Demon Lord's tribulation. Luckily, before she transmigrated, she had inherited her sect's sacred treasure from her master: a corpse coffin. Sha Zhou hid inside it and used its merit-gathering power to weather the tribulation. After narrowly escaping death, Sha Zhou discovered that she had transmigrated into the role of a beautiful, powerful, tragic female supporting character. The original owner had always been strong-willed, but was schemed against and left to live a miserable life. In the end, her fiance, who had searched for her for a hundred years, ran her through the heart with his sword, and she died full of hate. The incident that set the original owner's tragic fate in motion was this very tribulation. "Hah. Scumbag, even if weeds grow over your grave, there's no way I'm dying." Without hesitation, Sha Zhou sent her scumbag fiance a coffin. Sending him a coffin stirred up a hornet's nest. Attempts on her life came one after another, and on top of that, she somehow became a wanted criminal in the Demon Palace. The reason... Apparently, she barged into the Demon Lord's tribulation and made him disappear. Sha Zhou: "..." They all think this Celestial Master is an easy target, huh... And so, the cultivation world gained a female cultivator who dragged a coffin around and stuffed people into it at the slightest provocation. That coffin was so terrifying it could even hold an old ancestor who had survived the tribulation. Everyone: First time I've seen someone use a coffin as a weapon! * Because of Sha Zhou, Demon Lord Duan Li was forced to undergo three tribulations. He ultimately failed, and his body was destroyed, leaving him a ghost cultivator. His ghost-cultivator life had barely begun when, by a twist of fate, he became the junior brother of the woman who had gotten him struck dead by lightning. He also discovered that she had locked his physical body inside a coffin. A few old ghosts lived in the coffin. They reeked of corpse energy and chased him around every day, flinging talismans at him and shouting about vanquishing demons. Demon Lord: Which one of us is more like a demon, anyway? And that wasn't all. His nominal senior sister looked kind but was ruthless at heart, sneaking into the coffin every night to attack his body. After his soul was inexplicably locked into his body and tormented over and over, the Demon Lord finally snapped. Gritting his teeth, he said, "Third Senior Sister, if you have feelings for me, just say so. There's no need to..." "...??" Sha Zhou was busy figuring out how to refine the Demon Lord's corpse into a top-grade corpse general. Holy crap! The Demon Lord's corpse just sprang to life!!! And his voice was exactly like that of her junior brother, who always wore a deadpan expression, barely spoke, and acted as if she owed him millions... Theme: If you can't change the wind, change your course