and as other spoiler, OG Sihyun Ex was Ahn Jaeha, and he will harm Sihyun in the end.

Sanyu just happened to meet Sihyun at a party were he was Dru.. and [email protected] and also filmed poorSihyun, That why he trid to sperate him from jaeha (chapter 34) and also telling actual Sihyun (Hijin) to tell him if he remembers anything, I guess he and the other members feeling guilty about not helping him and giving him a cold treatment even though they were trying to help ..