This page contains spoilers about the Heartbound ARG. If you want to solve the puzzle yourself, avoid reading this article.
Artifact eye4

As always, look to the source.

<!-- If that is your true desire... -->
<!-- I will help you... -->
<div class="You will help me first.">
    <!-- ThatGuy + ThatOtherGuy -->
    <!-- XpnwHfZolKvtp -->


The first part of the puzzle is figuring out who the people referenced in the hint are. However, it turns out we can just ask. Add "ThatGuy" to the URL, to get an image of Binder:

Thatguy arg


As above, but an image of Baron:

Thatotherguy arg


This part of the puzzle is very much a "you get it or you don't" puzzle. The ciphertext is "XpnwHfZolKvtp", and from the hint "ThatGuy + ThatOtherGuy" we know what the key is, the question is how to decrypt it.

The first stop (and it's the right one this time), for any puzzle about decrypting a string given another string is Vigenere.

Use the key: "BinderBaron"

Given that, decrypt the string to "WhatDoYouWish", add that to the URL, and you'll get the Do You Agree page.