Az

He seems so different I'm so scared he's gonna be like sorry I forgot everything I experienced in this very specific time frame that somehow perfectly aligns with when I first met yoy

Idk, he looked like he had bandages on his wrists. So that seems like his normal self

Author doesn't, don't worry.
Spoiler below
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Sekye tried to kill himself hence the bandages on his wrist, he's now getting the help he needs, Yijun accepts him as is and they get back together because they literally cannot be without each other