This would really fuck me up if it ended like the manga Boku wa Mari no naka.
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»»[Spoilers. (I suck at explaining but:)] The guy ends up inside the body of a girl he constantly watched at the convenience store, but at the very end you find out that Mari just made herself believe that she was the dude. She watched him too so she knew a lot about him.
If it weren't because Taemin has his own memories while in Siwon's body (and tbh I'd say it's likely that there's no way Siwon could have met Taemin at any moment) I would say that it could be a nice plot twist....but that's just me....saying stupid stuff that won't happen lol it'll give you something to think about.
I was thinking on some plot like this too! XD Like it would be a litter more Sci-fin than supernatural like Moritat! Maybe Min Woojin father's corporatiom is in some research to implant healthy people minds(but with damaded body) on other's healthy bodys and Tae Min and Siwoo were by chance the guinea pigs for it. This research would help the actual heir (if he is still alive e.e) to still suvirve... Maybe in Min Woojin's body! '0' And because Woojin knew about the reseach he could immediately know that Tae Min was in Siwoo's body!>:D Not 'cause he "feel it" or some thing like that
I didn't realize I had stopped breathing until the chapter ended lol can't wait for the next chapter.