Videogame: I Can Turn Waste Into Treasure - Chapter 98 - : Blacksmith Class

Qiaosheng, you are the one who saves me, yet you are also the one who gives me hell. If we cannot grow old together, I’d rather we’ve never met before.

- Description from Novelupdates

Bankruptcy, divorce, wife's betrayal!At 35 years old, Yang Hao suffered a triple whammy!Yet, amidst such a desperate situation, he accidentally inherited a fortune from the game “Monopoly”.From then on, life underwent earth shattering changes!Money, reputation, status, commercial empire.Ex-wife knelt down and begged for remarriage? Sorry, when I was in trouble, you left me. Now that I'm better, you want to come and enjoy the glory and wealth?！you do not deserve!

Haruto Hayase was a normal high school boy in his third year, living a quiet life until his younger sister, Haruka Hayase, joined the same school. Haruka’s beauty and charm made her the center of attention, quickly becoming the school’s prima donna. But when a notorious gang leader set his sights on her, he did everything in his power to protect her—only to fail tragically. Haruka was brutally assaulted and tortured, and Haruto himself suffered an agonizing death. However, in a twist of fate, Haruto is given a second chance, waking up a year before the events that shattered his life. Armed with the mysterious ‘Debauchery System Slave’, he vows to exact revenge on those responsible. This time, he will use his newfound powers of the system and charm to seduce the loved ones of his enemies. From their mothers, sisters, and lovers to their closest friends, Haruto will make them his. His enemies will suffer as he steals what they hold dearest, ensuring their downfall in the most devastating way possible.

I finally managed to kill the demon lord.