I really enjoyed this little series!
Yes low budget, acting not suberb but plenty feels for this sweet, light watch. I really liked the pairing, good chemistry! It's a quick watch as well with 20x15 minute episodes. I enjoy this format a lot more than a feature length movie.
This one's actually getting an 8 from me because it delivers plenty for the time investment it represents.
I'll be sure to check out main lead Sung Hoon some more!
To offset some of the other reviews, spoilers ahead:
I can understand why some might feel the way he treats her are problematic, but I think given his backstory it fits his portrayed character quite well. The whole concept is that they are opposites sharing some undeniable attraction, finding weird ways to be and stay around each-other even though he in particular is quite jaded about the opposite sex (with good reason). One of the things i though beautiful is that he's so attracted to her energy. He keeps looking at the picture he took of her just beaming in the sunlight, the pure delight on her face, his smile as he was watching her. She slowly melts away his insecurities by being consistently pure of heart, and as that happens and he softens up, she starts to fall for him too. It really worked for me.