For the one who didn't open sound and doesn't understand the language (including me I saw someone translate it) Tha last one says: Conan: "What the hell with your double identity?" Kaito kid: "What the hell with yours?"
0:23 he’s in 3rd grade for your information Edit: I made this comment a few months ago back when I watched dub he is in 1st grade but the funimation dub made him in 3rd grade and 8 years old