Responses
Spoiler.
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I was thinking the same. Because of hints like his actions and knowing things. But we were wrong. He is not faking... I think he keeps it up after he regains his memories, at least with Rihan he does. It would has been better and more understandable if he was faking since the beginning....
Soooo I think Sohwa is pretending to have amnesia it's so obvious, the guy loved Miha since the beginning but he couldn't express his love or doesn't know how to do it because it's not his nature, and now he's faking the amnesia so he can do and say the things his stubborn and maybe shy self couldn't do in the past.