Lost warmth

At the Nelson mansion, 

"Are you sure you want this grandfather?" Noah looked at the golden invite that was addressed to Ariana and did not know what to make out of it. 

He knew that his grandfather missed his ex-wife but it still felt awkward to have her under the same roof as him, when their divorce was still fresh. 

'Not to mention, after finding out how deep her affection for me was—— it's even complicated to look at her,' Noah thought bitterly while staring at the name written in silver italics. This name now haunted him in his dreams, every time he dreamed of Ariana, he would find his heartache. 

In the past, when he thought of Ariana, Noah only had anger and blame. But now guilt was added in the mix which had made it certainly difficult for him to calculate against her. 

And uses her existence to his advantage such that he can find the murderer of his grandmother.