I Am The Game's Villain - Chapter 15 Need Money To Buy A Gift

Based on the popular Vocaloid series, by HoneyWorks, called “Kokuhoku Yokou Renshuu (Confession Rehearsal)“:

Natsuki, a third-year at Sakuragaoka High School, who holds unrequited feelings for her childhood friend, Yuu, who’s in the Film Club. However, instead of being honest about her feelings, she makes him be her confession “rehearsal” partner. Unable to say her true feelings, things start to get complicated when Miou and Akari, who are also in the Art Club, get involved! Will she ever be able to confess for real!?

Shi Jin once read a book. It was supposed to be about satisfying the desire for vengeance.

The main character, also named Shi Jin, was the sixth son of his harem-novel-protagonist-like father. All was well—while his father was alive. But after his death, Shi Jin’s five elder half-brothers tormented him, eventually leading to his death. The protagonist was reborn, determined to take revenge, and… the novel was discontinued.

That day, Shi Jin almost spat blood and dropped the book into a shredder. The next day, he died in a car accident. Somehow, when he came to, he had transmigrated into a teenager, a youth also called Shi Jin.

There was only one problem. His father had just died. His older brothers were about to torment him…

Shi Jin: Let’s eliminate my brothers’ hatred, my goal is to keep my life!

- Description from Novelupdates

Five years, Nan Xia devotedly cared for her husband who was in a vegetative state. After finally waiting for the man to wake up, what she got was: “She's pregnant now, wanting a divorce is a bit difficult, just throw her into the lake and let her fend for herself.”Five years later, Nan Xia changed her name and identity, with three adorable children, she sets out to punish the scumbag man, trample on the white lotus, and vows to make the scum man and the vile woman pay in blood!Yet the man pulls her into his arms, softly coaxing, “Honey, be good, let's not divorce.”Nan Xia's expression is icy: “Sorry! I don't know you at all!”

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