Life and Death are really a misery.{Sung Jinwoo x OC}

In a world transformed by Gates and dungeons, Hunters with supernatural powers defend humanity from relentless monsters. Among them is Sim Mee-Yon, a publicly recognized D-rank Hunter with a quiet reputation-but secretly, she is the S-rank powerhouse Moon-Yung, a mysterious figure with unparalleled abilities and a secret system of her own.

Mee-Yon's journey began in tragedy when, after an untimely encounter with "Truck-kun," she was reincarnated into the body of an 8-year-old South Korean girl. Her new life was far from ideal, marked by a fractured family dynamic. Yet, her bond with her younger sister, Sim Ae-Cha, offered comfort. The real twist? Mee-Yon discovered she had been reborn into the world of Solo Leveling, befriending none other than Sung Jinwoo, the future Shadow Monarch.

Blessed with a mysterious system that grants her powers akin to Jinwoo's, Mee-Yon can extract and "bloom" fallen souls into loyal spirit soldiers. With this ability, she secretly rises as a shadowy force against corruption, dismantling dangerous factions while maintaining her D-rank façade. Privately adopted by Hunter Association Chairman Go Gunhee as his "granddaughter," she is shielded from the public eye while preparing for the challenges she knows are coming.

Now 23, Mee-Yon faces a pivotal moment: the infamous double dungeon. Forbidden by her system from entering, she warns Woo Jinchul of its true nature, setting Jinwoo on the path to becoming the Shadow Monarch. Knowing the trials ahead, she prepares to join him, quietly altering events to protect those she loves while carrying the heavy burden of her foreknowledge.

This is my own creation, but the original story belongs to Chugong