I love the cast's diverse linguistic skills - makes it feel very authentic because the time frame the series is depicted in. Lee Byung Hun is a marvelous actor and really expresses Choi Yoo Jin(Yu-Jin)/Eugene's emotional conflict, sadness of loss and the slow increase in his subtle, but growing smiles... are indeed like sunshine, they're so beautiful to see. Kim Tae Ri does a beautiful job & I can appreciate the dynamic of her being a strong woman working toward bettering herself to achieve her goals but still hold a playful, musing air when (as Go Ae Shin/Ae-Sin) she interacts with Choi Yu-Jin. At times there were a few places where she seemed a little stiff.

The 2nd leads, Yoo Yeon Seok (Gu Dong Mae / Ishida Sho), Byun Yo Han (Kim Hui Sung), and Kim Min Jung (Kudo Hina / Le) are amazing in their own right. The chemistry, conflict, emotion of their characters were conveyed well. Each contributed something memorable for their characters, even as I type I remember each of them; that's how great a "felt" impression they left for me. The dynamic of the relationships between all the characters in this story flows nicely and is masterful as the the threaded connections slowly shorten bringing all of them together for better or for worst.

In some episodes, there were cuts in a particular scene that weren't cleanly edited so the transition & time flow were smooth, but it added to the effect/benefit of another character in the following scene. It also made it feel like the progression of time was longer than what it was.

So many sad moments, but 100% worth the tears