I don't think he knows how or is even able to achieve the ending he wants without Yoo. If Yoo is dead, then there is no way Dokja will be able to succeed in the subsequent scenariosI feel like this should be a bit more of a positive shock for him right now. Either Yoo is dead, which sucks, but it shows that the timeline doesn't end when he dies (since Dokja's been gone for an extra week), or it means Yoo isn't dead, and has managed to survive a week after the conflict, meaning that he got stabilized.