Secret Garden? I just finished watching it
yesterday. I watched the entire series in 2.5 days!
Would've watched it in 2 days flat but
had to go out and run errands.
It's enjoyable. I really liked the parts where he couldn't
help himself and kept 'stalking' her without knowing why.
I also liked the cheeky parts, for eg. when
he did sit-ups and made her hold his ankles so their faces would
come close when he sat up. 
I cried at the scene where he wrote the letter and started
crying on his couch. I knew what he was thinking of doing and
felt soooo touched! The scene of him driving off into the
storm with her in his car... priceless!
Do you watch it in Mandarin dubbing? I prefer to watch
with the original Korean dubbing and with English subtitles,
painfully switching over to Mandarin subtitles sometimes when the
English sub is really awful. I've picked up a few Korean
phrases that way, and I often practice on my Korean
colleagues. 