MTL - Unrivaled Medicine God - ~ 3078. Written before the end of the book

Our protagonist Caam is a man from Earth that was reincarnated into this world as a demon. In order to survive, he spared no effort in avoiding the sparks of battle and without noticing it, he became strong himself.

“Darling, I love you…” He was the heir to the consortium and she had just divorced. The day she was divorced, she was kidnapped and forced to be the doctor in charge of his case. To add insult to injury, this man would sleepwalk to her bed every two to three days… another headache!

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

Kim Bo Myung, after graduating from high school years ago was living a below average life as an employee of an entertainment agencies PR department.After getting run over he opened his eyes to see that he was back in the past in the body of a member of an idol group?!He gets a chance to regain his lost dreams and write a new legend in the entertainment world and also get revenge !