Avoid Yandere Constellation - Chapter 167:

“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.”

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

This novel is about the young master of the Du clan, Du Shaofu, who was born with crippled veins and is unable to cultivate martial arts . After finding out about his situation from the clan while returning home he got hit by a lightning and a mysterious ‘first scripture’ appears and after studying for ten years he was able to mend his crippled veins together and starts his journey to glory.

- Description from Novelupdates