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I have two theories about this story.
One, he is the real Jihoon but he had some physcological issues before the accident (like how he had bullies, maybe pressure of being perfect son etc etc) and after trauma he coppied another person’s personality. You may say “how about Wonjae’s memories then?” but if Jihoon admired him and shared some time with the real Wonjae, maybe that is the reason how he knows. Don’t think this theory makes much sense but it has potential.
Second one,
They do swap their bodies and real Jihoon was alive but that guy who tell the coach about Wonjae’s family was talking about some random funeral but not Wonjae’s. That makes sense now because blue haired guy also was a child, he couldn’t research after hearing that.
Now my consern is, how will Yongmin react to real Jihoon (if he appears I mean). Because he fell in love with the guy in that body, not the body itself so he should not waver.
I wanna see next season so much!
Sorry I don’t like lame semes