Reincarnated Nano Monarch

Jihyun, a former special forces sergeant with a black belt in Taekwondo, is hired as a security guard at a cutting-edge research facility. When armed intruders storm the lab, a desperate scientist injects him with an experimental Bio-Nano Chip AI System to safeguard their work—only for Jihyun to be gunned down moments later. He awakens in a completely different world, the artificial intelligence still bound to him, and names it Nano as he begins a brand-new life.