Fate Online: Shadow - Chapter 3: It's Him!

After years of longing, Mu Chenyan was finally going to marry the man of her dreams — Yuan Xuan. However, on her wedding day, the tragic death of Shu Qinger, her well-known romantic competitor led to Mu Chenyan’s prison sentence.

Liu Fang, a manager, died suddenly at work due to being too diligent.
She thought that she would turn into a wisp of dust and dissipate after her death, but she never imagined that – the new century, the new underworld, even if she became a soul, she would still be a worker!

Liu Fang has become a newcomer to the underworld Quick transmigration Department. In order to wait for a good reincarnation, she strived to accumulate merit and traveled into one world after another to repair the way of heaven.

- Description from Novelupdates

[You have become the first ever Player of Life in human history.]

-What did I just see? He can see the flu virus?

-The cell he made grew in the culture medium. This really looks like an embryonic stem cell… Is this true?

Leukemia, dementia, schizophrenia, lung cancer, and pancreatic cancer…

‘Can I overcome it all?’

[Of course.]

A confident message popped up.

Rosaline, the living cell that had become a part of his body.

With this cell, any research he did was nothing but successful!

His story of overcoming all diseases and illnesses begins here.

Disclaimer: Please do not take any medical advice from this novel or any other web novels.

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Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.

- Description from Novelupdates