I completed this drama with Chinese subs. I will give my general sentiments before providing a summary of the whole plot.

Overall, the plot was tame; nothing too extraordinary, exciting or surprising. It had a happy ending though. While I do not regret watching this, I believe that those who are unable to watch this because of incomplete subs are not missing out either. I am also not someone who typically rewatches dramas, hence the rating of 5.

Now, for the summary of the drama. If you dont want spoilers then stop right here.

Maejima has a secret affair with Takuma. One day, Shinonome, who transfers from the company's New York branch to Japan's branch, catches Maejima and Takuma acting intimately secretly in the company's library. Shinonome then begins to persuade Maejima to break up with Takuma, because he believes that she is worth so much more than being bound to a married man. Convinced she should not limit herself and can find a better love, along with her blossoming feelings for Shinonome, Maejima breaks it off with Takuma. Later, her colleague, Ono, and Takuma warn her to stay away from Shinonome. Knowing full well herself that she is already in too deep, she ignores their warnings.

Maejima and Shinonome grow closer, and they go out on a date. Unfortunately, they spot Takuma and his wife having a great time. Shinonome stares in a dejected? Defeated? Longing? manner at the two. This is when Maejima recalls the warnings from Ono and Takuma, and correctly guesses that Shinonome had been in love with Takuma's wife all along. She guesses that Shinonome only got close to her so that she would break up with Takuma, so that Takuma would go back to being a faithful husband. She runs off and their relationship halts.

The drama then rewinds to tell Shinonome's backstory, about how he fell in love with Takuma's wife. He loved her and had a relationship with her before finding out she loved Takuma all along. Being unable to have the woman he loves, Shinonome decides to at least make sure she is happy. Thus his plot of flying to the Japan branch and seducing Maejima and making her break up with Takuma.

The drama replays several of the interactions between Maejima and Shinonome, but this time in Shinonome's POV. At first, he thinks of Maejima as despicable and sought to make her pay. Over time, as they interact more, he begins to empathise and fall in love with her.

Fast forward to present time, where Maejima's and Shinonome's relationship is still estranged. Maejima decides not to pursue this relationship because she believes Shinonome still loves Takuma's wife, and hates her for making the woman he loves suffer. On the other hand, Shinonome has already fallen in love with Maejima, but decides not to pursue her because he has hurt her and believes he has no qualifications to get her back.

A bunch of work stuff happen and Shinonome tells Maejima that Ono (who has a crush on Maejima) is the man who can give her happiness before flying back to New York. Eventually, Maejima realises that Shinonome had loved her all along and flies to New York to look for him. The two meet and reconcile, and the drama ends.

Hope this summary was useful :)