Chapter 25 raws are are out and I had a feeling Kang Jinha died in 2016 AU which explains why Siwon 2020 had the stone. The guy from the bar didn't take it well so he wen Killing Stalking on Jinha.
In the Alt Time/ AU Yes he does, but it will explain why Siwon has a 3 year memory gap. Siwon might have time traveled back to the retreat house and made sure he never forgets his feelings for Jinha/Jun thus explain why he made out with him thus creating a paradox.
Chapter 25 raws are are out and I had a feeling Kang Jinha died in 2016 AU which explains why Siwon 2020 had the stone. The guy from the bar didn't take it well so he wen Killing Stalking on Jinha.