I've waited a while to write this review because I wanted to think about it thoroughly before I gave my opinion.
I personally felt like this drama started out extremely well and had the perfect formula for a tragic story. However, it felt like the director changed his mind halfway through and wanted to make this drama a happy ending.
Let me explain. The male lead comes from a broken family. He is extremely affected by his parents' divorce and their arguments leading up to it so he believes that love should just be kept far away because at the end "there are no happy endings" (a direct quote from the drama). He likes to exclude himself from the world around him because he thinks that if he gets attached to someone, it will only lead to pain. The female lead on the other hand is somewhat of a pushover and falls in love with the male lead because he cares for her. In fact he hates that she's a pushover and wants her to be confident and happy on her own. Basically they are two very different people with very different outlooks on life. When the male lead decides to move to America, she confesses her love to him only for him to reject her because he just sees her as a friend. This leads her to have commitment issues and later in life dates multiple guys just to get over him but she never truly loves any of the other guys she's met.

The rest of the drama is a very kdrama style story with a love triangle and of course the second lead is extremely nice and rich and wants to be with her while she is in love with the male lead. For the first time, I did not have a second lead syndrome. I just really liked the male lead.

There were many scenes in the drama where it seemed like the pessimistic dialogues that the male lead was saying were somehow a foreshadowing. The male lead mentions that he doesn't believe in happy endings and there was a dramatic closeup scene and I wish that was a foreshadowing. IT JUST MAKES SENSE YOU KNOW? Either I was overanalyzing these scenes or interpreted them wrong but the story did not go the tragic route which I was very disappointed by. I love happy endings but for this drama... I just wanted it to be different.

The leads were brought together by many coincidences and until the very end of the drama they weren't officially together. I wish the story took the route where the leads would not end up together because 1. they are very toxic for each other and 2. they have very different definitions of love. So they could've played with the idea of letting a person go because you love them but aren't the right person for them. I feel like that would make more sense with the way the scenes were set up in the initial episodes.
The side characters were fun and overall I like the cast. However, half way through the show became a very formulaic kdrama with a happy ending.

serendipity by ha sungwoon was an amazing ost and my wannable heart was happy. Talented actors and a story that had potential were kind of wasted :/