MTL - This Summoner is Outrageous - Chapter 20 failed course selection

Waking up from a deep sleep, Lin Yue found herself having transmigrated into a peasant's new wife, and to make matters more complicated, she was a replacement for a deceased wife. The husband, over a decade older than her, had already lost two former wives. It wasn't so much a marriage; she had been sold to the family by her unscrupulous parents. Her fate was out of her hands. Before her stood one, two, three, four children, like a line of burdens, all gazing at her with blurry and hopeful eyes. Lin Yue felt an enormous pressure, “Thanks to Yuewen Book Review Group for providing review support!”

“If I were ever reincarnated in another world, I’d be the ultimate villain.”That was the last thing Ace joked about before getting hit by an out of control ambulance–ironically, while saving his best friend.Truly, Fate has a twisted sense of humor.Now Reincarnated in a fantasy world, Ace isn’t a chosen one, a prodigy, or a hero. He’s a background nobody—an extra in a story already set in motion. Weak, talentless, and scorned by society, his new life seems doomed to follow the same path as his last: forgotten and meaningless.Destined to be killed off early in the plot, With no noble bloodline, no rare mana affinity, and a world stacked against him. Ace must rise from the ashes of his failure and break this tradegy, the only way he knows how.But Ace isn’t the same person he used to be.Armed with wit, ambition, and a twisted sense of justice, he refuses to bow to fate. If the world wants a villain, then a villain it shall get. He’ll climb the ranks, topple the so-called heroes, and make sure the world never overlooks him again.This time, the extra is writing his own story and it starts with CHAOS.But as he treads the line between fiction and reality, a bigger question looms—Was his reincarnation really an accident?

After successfully reaching the Core Formation Stage and forming his Golden Core, Bai Langtian was betrayed by his own Master. His core was ripped from his body, and he was thrown off a mountain cliff into a valley full of demonic beasts.Thankfully, he survived the fall, and met his senior sister, Shangguan Yue Ling.She too had been betrayed by the same Master and pushed into this valley ten years ago. Ever since, she had been surviving alone by eating the corrupted flesh of demonic beasts.Now, Yue Ling revealed to Langtian a new path of cultivation:Demonic Cultivation.To reclaim his strength and take revenge, he must consume the flesh and essence of ten thousand demonic beasts.

Huang Dan’s pain nerve is innately different from the ordinary people. A little tore in his skin can cause him to sweat all over his body painfully to the point of him unable to make a word out.

Somehow, he began to cross world, following Mr. System to do the tasks…

In the first world, Huang Dan realizes what it means to die painfully and to live to die again.

TL’s summary:
MC suddenly transmigrated and is bind to a system, requiring him to solve mysteries. Born with a higher degree of pain sensitivity, he met different people in the different worlds and learns what kind of emotion smiling is.

- Description from Novelupdates