MTL - Mysterious World, I Have Special Understanding - Chapter 13 you found out

Ian was an ordinary guy on his way to work when he suddenly found himself in a strange and dangerous world ruled by dark races like vampires, werewolves, and demons. Transmigrated into the body of a lesser vampire, Ian must quickly adapt to his new reality where survival is a constant struggle.Just when all hope seems lost, Ian discovers he has a unique advantage: The Strongest Body Customization System, which allows him to modify and customize his body by consuming biomass. With this golden finger, Ian starts to turn the tables, designing bone claws and other enhancements to give him an edge against the terrifying werewolves and other supernatural threats.But as Ian learns more about the Curtained Imperium and the rigid hierarchies of the vampire race, he realizes that defeating his enemies is only the first step. To survive and thrive in this dark and brutal world, Ian must rise through the ranks, uncover the power of his system.Need to fly? Customize a pair of angel wings!The body is small? Add hundreds meters of height and become bigger than Godzilla!Need a weapon? Customize bone claws and kagune on the spot!

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 !

One morning, after being bound to the system, MC started his routine of always being captured/ attacked by the ML.

There are all sorts of lunatics in the world:Self-centered, reckless, psychotic, impulsive, obsessive, and pe*verted.As far as Suin knows, that man embodied every single one of those traits—an obsessive, pe*verted psycho.And now, that lunatic is back.“Finally, we meet.”“Adult Lee Suin.”He didn’t even try to hide the sticky hunger in his gaze, like a starved lion finally spotting its prey.“A job reassignment?”“I want Lee Suin to help me.”Chairman Woo Ilhwa, unaware of his son’s true intentions, reassigns Suin, his chief secretary, to serve as his son’s personal secretary.This forces Suin into close proximity with the man who’s been preying on her from the shadows.“Wait for me, Lee Suin.”During his eleven years of exile, Jaehee had dreamed of one thing:A proper relationship—not as a restricted minor, but as a full-grown adult.A relationship where he could take what he wanted, whenever and however he pleased.That’s why, even though Suin was as rigid as a steel rod, his sly persistence ignited the spark within him whenever he faced her.“What do you want from me?”“You.”“Lee Suin.”But it seems Suin has been flirting with some bastard behind his back, and Jaehee’s jealousy and obsession explode.“Don’t take a single step.”“Unless you want to see me go completely insane.”What nonsense.You were already insane to begin with.