I don't think the title is on NU because I found it while looking at untranslated CN novels. Basically the summary is that MC endured a bunch of hardships in his life and somehow found himself transported to a parallel universe. He found a younger version of himself (ML) but noticed that younger him somehow didn't have the same resources that he had in his life so ML was destined to fail. Therefore, MC decided to take ML in. It might have been an interstellar or futuristic setting but I'm not quite sure. That's about all I remember and I was wondering if anyone happened to stumble across the novel.
Not a futuristic setting, but otherwise similar premise: Junior Brother Always Wants To Bend Me. If not this one, then could be one of the recs in this thread or this rec list. There's also this other Forgotten Title thread that might have what you're looking for?
Hmm, I don't think it's any of these. I vaguely remember the summary had something referencing "garbage" or "trash" as if ML lived either in a slum or on a garbage star. I don't recall MC body swapping either, he was just himself.
I think I found it, or maybe not because I could have sworn I read the synopsis earlier than this novel was published... Who knows! 偏执奶狗竟是我自己 (Unexpectedly, the Paranoid Pup Was Myself) by 意绵绵 http://www.jjwxc.net/onebook.php?novelid=5455796 MC rebirthed to 10 years prior and found his 13 year old self. He changed his name and fostered his younger self ML after he was almost beaten to death by his drunken abusive father. After ML grew up, MC went abroad. When he returned, he found the capable yet paranoid ML waiting for him.