i can't remember episode 3 karen, LOL. i missed like 2 or 3 episodes because i was watching them on youtube, so i couldn't find the whole season 1. but yea, the first time i heard planetarium was in HYD, but the song sounded sooo familiar to me, like i knew the artist that was singing it. when i found out it was ai (i knew of her back then) i was like "OMG!", literally, lol. it shocked me because i heard CHU-LIP back then too, and you know how her voice sounds in crazy songs, haha. so it shocked me to hear her sing so beautiful in planetarium. then i was hooked
sigh....i love HYD so so much