The CEO's Husband Taming Guide

Ethan Grant forced to break up with Celeste; he joined army. Five years later, Celeste (CEO of Battery Tech) reunites with Ethan. Celeste hires him as bodyguard. Hostile Forces covet tech; deputy manager undermines. Ethan (Reaper) protects. Ethan's sister reveals Gu family's identity, resolving their past. Colleague bribed to steal data. They catch insider, submit tech to state. Ethan proposes. They resolve gap, marry, live happily.