It really did seem like he couldn't fully remember Ha Ran. Only that she's familiar. Like when her grandmother asked why the character looked like Ha Ran his answer seemed genuine. I think his memory isn't fully back. The old guy who works the cafe was also talking to him about his memory coming back now. Wonder what truly happened fr. He did seem afraid but also seemed like he didn't know why cause his memories were flashing. Later when he runs into her he could talk to her normally too. Yeah I think he's not fully there like he's trying to seem. He's def faking a smile and still going through complications. Im so glad this has 2 episodes a week, I wanna binge😭😭😭The pain
It didnt make sense to me why Ha Ran saw Chan as a nerdy engineer student when Seon U Chan is not like that. At first I thought maybe they were strictly online but with Ha Ran knowing Chan's sister no way she wouldn't know what he looked like. Hyeok Chan and Seon U Chan are not the same person. They could have even dated in Korea before he left for Boston but Hyeok Chan fell out of love.
Hyeok Chan could have bullied Seon U Chan into pretending to be him. Which could explain the bruises. OR Seon U Chan had a hard life and lived "through" someone else. In general, I think Hyeok Chan had Seon U Chan to pretend to be him. Seon U Chan eventually started to like Ha Ran which is why he hesistated when he had to tell Hyeok Chan that Ha Ran was on her way. After Hyeok Chan died Seon U Chan got mentally better but he also lost his memories that are slowly coming back to him. Seon U Chan probably did and still have hearing issues as shown in the fire work scene. Maybe the hearing issues are only in flashbacks cause it's fixed, but may come back up later on? We'll see.
Ha Ran remembers Hyeok Chan but with the fact she knows his sister, she knows he's 100% dead. Which is why it doesn't cross her mind that Seon U Chan might be her Chan. Because he's not. Paired with what others said, Seon U Chan could have been her boyfriend's roommate.
That’s also what I think, he fell in love with her but she doesn’t know him
she doesn't have memory loss but he does from the accident. And ig his hearing will come into play later. My guess is he has partial ear issues that will become an issue later
Why did Chan look annoyed in the beginning when Ha ran texted him? It felt like the Chan she was dating was different from the chan we were shown. My guess is he was catfishing her or something 😭Also in the very beginning when Ran was on the phone it looked like he was looking back to see it almost like it wasn't his phone.
Im also confused how did his name not ring a bell to her. Like is she the one with amnesia?
It feels almost like she didnt know what Chan looked like. It felt like the Chan she was dating was different from the chan we were shown. My guess is he was catfishing her or something 😭She 100% is convinced Chan died to the point it doesnt cross her mind that this could be Chan. I also wonder what happened to the friend who claimed to be Chan's sister.
News 
Hyeok Chan could have bullied Seon U Chan into pretending to be him. Which could explain the bruises. OR Seon U Chan had a hard life and lived "through" someone else. In general, I think Hyeok Chan had Seon U Chan to pretend to be him. Seon U Chan eventually started to like Ha Ran which is why he hesistated when he had to tell Hyeok Chan that Ha Ran was on her way. After Hyeok Chan died Seon U Chan got mentally better but he also lost his memories that are slowly coming back to him. Seon U Chan probably did and still have hearing issues as shown in the fire work scene. Maybe the hearing issues are only in flashbacks cause it's fixed, but may come back up later on? We'll see.
Ha Ran remembers Hyeok Chan but with the fact she knows his sister, she knows he's 100% dead. Which is why it doesn't cross her mind that Seon U Chan might be her Chan. Because he's not. Paired with what others said, Seon U Chan could have been her boyfriend's roommate.
ok confirmed i was right