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He must have went straight to where Doc Dan was, since he has been restless and for sure can't help himself but go to him right away when he knew where he is.
He must have waited outside, saw Doc Dan out, and has been calling his name. He must have followed him, the attention seeker he is, ignored by Doc Dan not knowing Doc Dan already lost his sense of self from anxiety and alcohol
I'm so glad he was there, God, please how much more can Doc Dan take. Please, how horrible Jaekhyung as a human is, I hope he can be a strong support for Dan.