Hana Yori Dango (Boys Over Flowers or Boys Before Flowers) 52 episodes! based on Yoki Mamio's manga status: plan to watch
The same manga also inspired the Taiwanese drama "Meteor Garden" and jdorama "Hana Yori Dango". I havn't watched this as well but they basically follow the same plot. Tsukushi is a poor girl who captures the attention of the notorious F4. The group consists of the most powerful boys in their elite school.