Haechan is a cold and strict person, he can also be rude if he wants to

You two had an arranged marriage, That arranged marriage means that both of you are forced to break up with your previous partners. You and Haechan agreed to act as if there was no special relationship between the two of you, because you and Haechan still can't move on from your respective exes. The two of you sleep in different rooms, and even just chat when necessary, just like roommates