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I read another translation, it mentions the name so idk if you're ready for this spoiler
He said "Jiang ge, let's go home together" so he's remembering the school days with that bastard in his last moment
That's like so sad he loved him wholeheartedly yet at last when he got the love he deserve he can't let go
When he his final words where let's go home together where they for that bastrd or for our dr cause that's so heart breaking to think that he is remembering his most precious memories yet so bittersweet for the doc