From episode2, YiA and fakeEByul are acting like friends, closed friends because YiA thinks that she's EByul and because she has amnesia. It's safer to trust someone who is supposed to be your childhood friend...But from the moment EBin regained her memory, the only person who can really help her is the only one who knows her real identity, TK. EBin doesn't want to tell YiA the truth because she doesn't want to lose their friendship, even if those moments were only "stolen". Even if she acts as her twin, she never has a friend that reliable. It's understandable but at the same time, she wants him to accept her existence because she really cares about him. I just don't see where the LOVE is in all of this!!! When did she really fall in love with him? Like TK fell in love with her, and I mean with the real her, EBin. And what about YiA, does he even know his true feelings, without a doubt?, and even so, what about his feelings for EByul? Just erased just because he prefers now her twin's temper? But for how long because EByul really rocks :)
And when EBin wanted to give the gold medal back, she wasn't supposed to see YiA and she talks with him only because he came at that moment at the swimming pool. And their talk sound like a goobye but just because YiA finally decided to give EBin a medal (not the gold one, right?) and he seems to be shocked, jealous by TK's behaviour, we're supposed to feel the LOVE. Come on writers, don't be lazy...Make it believable but I have to say, it's kind of too late...It would be like some patch-up last episodes to make the lead couple happen.
And for TK, I'm not so sure that EBin deserves him. After all of those rejections (parents, classmates, EBin) he needs someone strong enough to love him, to understand him even if he's sometimes a grenade! :) and it takes courage to love a guy who has so much scars but he's worth it, I'm sure of it! If EBin takes that leap, this couple, TK/EBin can endure, together, whatever life can throw at them. So...