It's a song from the Korean drama "Big", which I'm currently watching.
I just came back from watching the 9th episode and the ending was so full of emotions that, in my current state, I'm not able to continue with the 10th episode.
I'm totally under this drama's charm, that's why I want to share this beautiful song with you!
"Kyung Joon...there's something wrong with me. Why am I...so happy that you came?" - Gil Da Ran (Big Episode 09)