Edit in JSFiddle

$('#btn').click(function(){
	var newBtn = $('<button/>').text('호옹이').addClass('btnbtn');
	$('#container').append(newBtn);
});


$(document).on('click', '.btnbtn', function(){
	alert('호에에에?');
});

$('#btn2').click(function(){
    var newBtn = $('<button/>').text('호옹이2').addClass('btnbtn2');
    $('#container').append(newBtn);
});


$('.btnbtn2').on('click', function(){
    alert('호엥?');
});

<button id="btn">버튼</button>
<button id="btn2">버튼2</button>

<div id="container">

</div>