hehehe, I saw that you are having some sort of crush on Jackson ;-)
That's OK because I could not help myself either. I had one glued on JW and another one on Jackson.
I loved STS because I got hooked on Ji Sung when I started watching Kim Soo Ro (which by the way, it had Jackson again) last year and i watched all of his dramas including this one. I liked it alot. don't worry, not going to spoil you.
I too have issues with Song Yuri from her acting in HGD and I can't stand her in any drama. she was less annoying this time though. enjoy the rest of the drama