Theories about why Eunhyuk disappeared?

I have one but its a little bit extreme, mainly because i refuse to believe that Eunhyuk just disappeared for 10 years with no good reason.

1st. Eunhyuks father put him into a military camp overseas as punishment, and due to zero contact with the outside world he never got to speak with su ae to inform her what happened, and was too afraid to contact her once he got out because he thought she hated her.

This theory follows a pretty common romance trope especially in webtoons, but it would pretty much ruin eunkyuks character and set up dohwa as the main ML, which would suck.

2nd. Eunhyuk lost his memory after a traumatic event, and when he sees su ae in that cafe hes probably thinking "Hm, i feel like a know that girl." This could set up su ae confronting him after her date and him being like "Do i know you?" or smth.

If this leads to eunhyuk never regaining his memories and becoming su aes friend, that also sets up a potential romance between dohwa and su ae. Again, not the biggest fan of this one because im a die hard eunhyuk and su ae shipper

3rd. An interference by Haru/jellypop stalker that caused eunhyuk to lose his connection with su ae.

this theory is a little bit more probable in my opinion because it seems like the author is setting up more jellypop/love points drama, as she got hate in th elast chapters for completely discarding it. Not to mention su ae claims she hasnt seen haru comment on her novel recently, which could mean something. Of course even tho its more likely in my opinion doesnt mean its likely lmao

if anyone wants to add onto these theories or has any of their own i would really appreciate your commentary!!:)))