Seungyoon wouldn't show it, but he'd be really flustered. He'd probably just laugh it off and not make to much of a deal out of it.
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Jinwoo would get all shy and flustered when you kiss him in front of the members. You guys almost never show PDA because he's so shy but you just couldn't help it.
I feel like Seunghoon would be like Seungyoon. He would try not to show how flustered he is but, on the inside, he's dying.
Mino would get all cocky when you kiss him in front of the members. He'd think he's the luckiest guy on Earth when you kiss him, although, on the inside he's freaking out.