The main couple living together, their interactions and personal traits, the silly faces that the male leads can make are the same, they are especially lovey-dovey

There is romance between 2 childhood friends, though they do not get together. The main couple's relationship and personal traits are quite similar, they give the same feels, they are especially lovey-dovey

In W the male lead is from an other World, and in Hit The Top he is coming from the past.
Though that was just the only similarity. They give absolutely different feels.

Both relationships started as friendship (where the girl is reluctant and the boy pushes him on her) and they liked someone else so first they have to comfort themselves. To get together they need a slow development which gives the scent of real life. (and that is awesome! :))Enrique's and and Joon Hyeong's personality and attitude to life and to their loved person is quite similar. And to be honest, Enrique's smile always reminds me of Joon Hyeong's. It's just adorable <3