The pain of losing someone you know is much worse than the grief of losing someone you don't know. But the truth is that the two can't be compared. Losing a parent after having known them is incomparable to when you hadn't known them.
That's for those who hadn't had the chance to see them and don't even have memories with that special person. Such was the case for Zi Han. He knew his father loved him and he was looking forward to finally meeting his son but tragedy struck before that could ever happen.
Unlike others, he didn't even have a video recording, a voice recording, or an image to refer to. He didn't even know what his father's name was. Thus this pendant was the only thing he had. The only thing that belonged to his father that he owned.
Losing it was equivalent to tearing apart his heart thus he couldn't live without it. It was because of this that he fought so hard to regain control of his body.