It's basically the same as him being really good at maths, but because the og Hajin sucks at it, he can't answer a single question. THE PLOT HOLES!!
Unless if the body remember the trauma. Even if consciously speaking, he's not the real Hajin, the body is. If the body is so traumatized by it, he can't do anything about it. Just like how he couldn't drink or eat spicy food, even though he could do it in his original body.
true... but trauma is usually mental and associated with the memories, but I guess the body could still freeze up in a sort of muscle memory kind of way, just not to the extent of letting himself drown
Idek anymore, i'm just in it for the ride~
I don't get how because the og Hajin doesn't know how to swim, the current Hajin can't, when to swim it's literally just using your brain to know what to do, there's no muscle memory. Like whatt.. he knows how swim but he's just gonna let himself drown???