I've already watched this for like a month or year now, and damn I still got the chills from it, and I kinda feel like I gotta share my experience with this tremendous K Drama. I've watched a lot of K Dramas since then, and so far, this is still the best for me. The romance, comedy, coolness, action, great plot etc I think every genre that you would wish for a series to have is already here, and I do suggest watching Touch your heart after this one, because the sub couples here are the main characters there, and its like the continuation of their story
