Both dramas are very atmospheric and visually stunning. Both couples have insane amounts of chemistry, with stories that touch on mental health issues and have a seemingly aloof and cold protagonist that's, in a way, misunderstood.

In both dramas there is an idol group who is struggling both as a whole (their popularity has tanked), and also each member individually is dealing with one thing or another.

Each member gets help from the main characters to overcome their personal battles, and in the end, they all get closer and the group comes out stronger and more successful.

Same vibe.

Both are softly colored, with a very chill, calm feel to them. And a certain sensual factor. Plus, you know, eye candy ;)