I Have the Alchemy Emperor in My Head - Chapter 20

Qiao Chen was mysteriously transmigrated to the interstellar era. As an adult from his original world, he was forced to grow up all over again in this new one. Now, out of nowhere, he was requested (forced to take on) with the inexplicable task of jumping from world to world to save the high general’s soul.

Throughout his journey, Qiao Chen finds that these worlds and bodies he’s jumping in and out of are his previous reincarnations. Whether or not these all culminate into coincidences or a predetermined destiny, there’s things that must be done while completing the main task:

-Avenge his past life

-Take revenge

-Fulfill past regrets

-Realize those lost dreams

-Make up for past failures

Since God has given him these opportunities to rewrite his fate, why wouldn’t he be pleased to start-over?

- Description from Novelupdates

Having been confessed by the person you in love with must be a dream come true.That happened to me. However, I found out later that the confession is not meant for me but for my classmate named Kyzer. he’s handsome, rich, and popular. On top of that, he’s a top student.It all happened because of the tiger costume I am wearing .Feeling defeated, I went back home with a bleeding heart.On my way toward home, a white van stopped in front of me and abducted me. I was abducted because they thought I was Kyzer thanks to the costume.A series of misfortunes befell to me one after another.When I opened my eyes again, I found myself in an unfamiliar room. Then I become the subject of a weird experiment.In the next day, I woke up in my bed by a loud ringing and discovered some weird widgets floating in front of my vision.I learned later that the peaceful city I was living till today is now in an apocalyptic situation. Demonic creatures were running rampant causing chaos to the land.Using my System, I will survive in this apocalypse.

You, yes you! It's you! Why are you running? Run, keep running! Why don't you run anymore!Do you have an Otherworldly Affairs Office pass?And selling this world’s goods, did you pay the taxes?I don't care if you're the head of an Immortal Sect, put your hands on your head and squat by the wall! Prepare for inspection!

Jacob Steve, an Old Man, died at 116 after living a whole life.

But Jacob always had a dark side, which he always suppressed and hid from others.
However, in the later years of his life, when death was inevitable, he understood there wasn't any point in having wealth, knowledge, or desires if you couldn't have a life to enjoy them.

He became obsessed with fabled immortality and devoted his reaming life to extending his fleeting lifespan, but just like any other failed.

However, he mysteriously got another chance at life and found a way that led to fabled immortality.
But he was also forewarned that the way led to it was filled with blood and darkness!

In the end, Jacob chose it anyway with no way of going back, and it was also the start of his suffering and his icky, brutal journey toward the 'Immortality' he wanted so badly!