So, the "Sasha is Summer" theory is up and running again? The Petrovs family adopted or kidnapped her, wiped out her memory, cleaned up her moles, gave her a new identity and voila, Summer is not so gone? And MC, who's dreaming of her every single night in his life after "that event" didn't recognize her at first sight? It's safe to assume that she is a public person, uses social media apps like Aurora, attending public events, e.t.c. Is it possible that she doesn't ring a bell to anyone who used to know her before? Elsa, for example?
Okay, I didn't even try. She suffered during "that event", got amnesia, lost her memory, ended up in an orphanage. And then the Petrovs adopted her. Lost moles? No one can recognize her anymore? Consequences of plastic surgery after the incident. Strange behaviour toward MC? Fragmentary memories of the past, she is about to recall something. A twist? A twist!
Methinks that the idea that MC came up with Summer in his broken mind (consequences of childhood trauma, loss of the parents), and it was Nami who was actually with him, and pretending to be his imaginary girlfriend, so that he would not be locked up forever in a psychiatric hospital, is way more interesting. Unfortunately, this is too contradictory to the current story.