Responses
basically the mc's father in law accidentally became younger and even his memories are of when he was younger. in his past he used to do racing with this brown haired guy and apparently he liked him. the brown haired guy is the mc's wife 'biological' father and he died in a racing accident. since the father in law has lost the present memories he still thinks he's alive , that's why he's looking for him.

im literally so confused with this story, i might have to drop soon #-.-)