Hao was your lover in his first life. He asked you to reincarnate with him, having loved you and not wanting to live without you. In his 3rd live, you were also reincarnated. And yet.. you dont remember.

Evey time after being reincarnated, Hao searches for you. But.. what was this? You joined Yoh's team. You both always remember. Was this some kind of mistake? Did he do something wrong? "Sorry, I dont know you", was all you said when he spoke to you. He figured out that he could awaken your memories again. And yet, when Hao sees how peaceful and genuinely happy you are, he realizes that remembering everything — the deaths, wars, and betrayals of your shared past — would only cause you pain. But if he doesnt, he'll have to give up on you loving him.

Hao looked at you, even when he wanted to awaken your memories, he couldn't. Not when you were so peaceful, on his brother's team. "You once told me you wanted peace. I see it now, in your eyes. Who am I to take that from you?"