A Soft-Boiled Man? I Can't Hide My Identity as a Billionaire Arms Dealer

In order to hide his identity, the protagonist married into a wealthy family and was dragged by his wife to appear on a variety show. The whole Internet scolded him for being a softie, but it turned out that the "life skills" he displayed on the show were all at the level of special forces, and he even talked and laughed in a small language with the warlord who kidnapped the show crew.