Mystery girl in drama

A girl that look mystery in 1 singapore drama..She came find the guy whenever she want and never leave any contact for that guy..The guy absolutely love her..But she is too mystery and she just always look sad and quiet..Nobody know what she is thinking..One day,they found that the girl came to find this guy is just because he look very similar to her ex boyfriend who already dead..This guy was very sad when he knew about the girl like him just because of his similar face..However,he told the girl that he dont care about just being a replacement,as long as she let him love her...The girl reject his requirement and she still very suffer that she know she cant do that cause she still love her ex boyfriend very much..I feel i can understand what the girl suffering for and the reason why she reject the guy...She know if she did that,she will be very selfish...The relationship of her n her bf already leave a scar that inside her heart and this will last for maybe whole life.........She dont ever want to hurt anyone else..