For me is Itazura na kiss. It's the best
Hana Yori Dango and Hana Kimi ♥
Like many others here, Hana Yori Dango. 
Hana Yori Dango and it was the reason I am here today :) 
Oshin. Still my favorite JDrama
ryusei no kizuna! still makes me tear up thinking about it ;;
ikemen desu ne...... it all started because of you're beautiful
For me is Itazura na kiss ~ Love in Tokyo 
Bloody Monday, and got introduced to Miura Haruma and Sato Takeru :)
Mine was Zettai Kareshi because I liked the manga back then.
I sadly don't remember but I think it was either Yamato Nadeshiko Shishi Henge, Nobuta wo produce, Hana Kimi or Death Note (the first movie) lol