MINOR SPOILERS
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I think my first serious case of SLS was in School 2015. Yup, I seriously thought the writer-nim would make those two end up together (you know who I'm talking about), but boy, was I wrong. That was really depressing...rip.
I second Reply 1988. Ahhhh, I was a Jung Hwan-Duk Seon shipper from the start, but converted to team Taek in the middle. I still felt really bad (esp that confession scene!!) for Jung Hwan, but I was happy how the drama ended (cue all the angry team Jung Hwan fans). AHHHHHH Hyeri and Ryu Jun Yeol are officially dating!!!!! Couldn't be happier. :-))))
I also had serious SLS in Dream High. Throughout the drama, it was hinted who Hyemi would end up with, but I was still surprised. In my mind, I kept telling myself, "It could have gone either wayyyyy." Yeah, that was pretty depressing...
Moonlover: Scarlet Heart. Need I say more? This SLS was a bit deceiving, since one of the guys started off really nice, then turned evil (classic). I shipped the right ship, but that ship didn't actually sail.
Yeah, SLS has ruined my life. *cries*