Help me guysss

Hello i forgot the title of this bl manhwa but its about a guy who works for the army i guess? He was sent in a military place by his uncle? Im not sure but he has a genius brother who manufactures weapons. He was sent to this military place to train, then he met the ml during a visit of an another military branch in another country. They were in beef with each other, at first, but the guy complimented the mls hands during a videocall (but he dosnt know it was the ml) ty guys thats all i can remember （￣へ￣）