Everything about it is so suspicious. Let's assume we did have an accident, but he didn't even have a single scar on his body. How can you not have any scars when your girlfriend and driver are both dead? Also, he wakes up in some unknown place. Secondly, Juyeon isn't telling him anything. Instead of saying, "My sister is dead," she keeps silent. Furthermore, he always wakes up with that weird dream, and we all know what's going on. Juyeon is a red flag for sure, but I hope his sister is still alive. I don't want him to have any connection with his sister's death, if she is indeed dead.