Who cares. Watch drama for plot or don't watch. Cmnts like yours are soo damn annoying smh.
A drama isn't only a plot, actors and their abilities to act also important. And those damaged faces are really annoying. They are so stiff and you can't help thinking about that.
They are acting like teenagers. Is it mature and not cheesy?
I agree events are mature, however their reactions aren't and it's not because of love's nature, but because of weird conception and interpretation. People in different age groups act different, their behaviour and reactions is changing. However they often just stay like teenagers in kdramas :))
Was Lee Jong Suk confusing this drama with a commercial? His acting here is like he promotes or sells a product. Supporting characters are more interesting.