Lu Feng transmigrated to another world and was swept into the great war raging there.
He gained a cheat that granted him heaven-defying comprehension.
Ding! You have gained Master-level boxing from your fitness boxing class!
Lu Feng: This is a world of modern firearms, and you want me to become a boxing master?
Ding! You have comprehended an unparalleled kicking technique from that kick just now!
Lu Feng: ...Let me repeat myself: this is a world of modern firearms, man!
Ding! You have comprehended an unparalleled marksmanship technique from a Mauser pistol!
Ding! You have comprehended...
The commander: Lu Feng's punches and kicks are decent. In ancient times, he'd have been a mighty general... But now... What? Lu Feng has taken five provinces?
The Japanese: You have to play fair! If you've got the guts, stop sending Lu Feng out!
Uncle Sam: The enemy has Lu Feng, but we're not afraid! We've got nukes... What?! Lu Feng built a nuke?!
Flipping the table, how are we supposed to fight now?
Lu Feng: It's time we settled a few scores!
I like a good opening, the egoism of modern characters, and the changes in special times.