Well, my curiosity killed me...emotionally. I've been seeing this japanese drama, Koizora (Sky of Love), repeatedly as I was browsing for a J-Drama to watch. I decided to give it a try after reading the comments.
There were several blinking neon signs that the drama has a tragic ending (I'm a happily-ever-after kind of a person), but i went on and started the first episode, it was sad, the way she talked of how Hiro taught her about love and that he was no more. All of the episodes have this melancholy vibe. What had the water leaking was when Mika lost her baby, when Hiro discovered about his illness and when he died. Until now the tears won't stop, every time I lie down I kinda get these flashes of the drama; especially the tree by the river, then I start crying.