The Black-Haired Mercenary Who Went West

Seven years as a South Korean special forces soldier, seven years as a mercenary.
Then he was possessed into the Wild West era (i.e., he transmigrated to the Wild West).
“Why is a Joseon man here…”
The Wild West. The Gold Rush. Cowboys.
And outlaws.
It’s the Wild West, a chaotic place full of romance.
It’s Texas, mid-19th century America.
No Status Panel**/ S*avery / Civil War / Pinkerton / Buffalo Bill Cody / Billy the Kid / Rockefeller Gilded Age
**[TL: author is indicating that MC has no OP cheat or golden finger like a leveling up system]