When I started this drama, I had very high hopes. And to be very honest the first few episodes did match my expectations. It was all light hearted until the FL reveals she had a terminal illness and the SML comes into the scene.
I'm not saying this drama is boring, however it is over complicated. The FL has so much on her plate, the ML has his own problems and then there are family problems. It's sometimes, too much.
I'll first start with the ML. He has feelings for the FL since he was a teen. Now that sounds so wholesome. However it seems like he has forgotten his feelings and now that the FL is back his feelings are back as well. This isn't impossible but somehow doesn't sit right with me. Felt like he only loved her till she's in front of his eyes. But his feelings were genuine and sincere.
Now comes the FL. I have major problems with her character. She takes the ML as her friend only. But out of a sudden she has feelings for him which felt too forced. In the initial episodes it is implied that the SML cheated on her, however, he doesn't. Instead he took care of her and was the only person to be with her during her tough times. However, she leaves him just because of a little outburst due to frustration. I mean it is understandable that she was hurt but doesn't mean she would end things like that when he was the only one she relied on during her illness. The SML felt more of a victim than her.
But even after all of this, she doesn't seem to move on from the SML. She cries for him, she misses her moments with him as well as she even relies on him when in pain. She cries when he leaves but boom the next day she has feelings for the ML. ARE YOU KIDDING ME!!?? She even accepts that herself that it was too fast.
One more thing I felt was that she didn't love the ML as much as he loved her. The ML continuously tries to make their relationship official and tell their parents but she stops him everytime until their parents catch them.

It was all over supposed to be a light hearted drama but it had too many flaws according to me. The leads were great as friends but fell apart as lovers. The SFL and her partner's relationship was much more interesting. However I must appreciate Jung Haein and Jung Somin for their great acting. The script and the direction needed to be much better.