In answer to your spoilery request, there's Black & White, a Taiwanese drama available atall the usualdrama places.
The character I'm thinking of is a major-minor, but her story is definitely plot-critical and has a major effect on one of the main characters. Furthermore, in a description that completely gives away which character this is, she disappears, comes back, fakes her own death, then comes back to aid the main characters' enemies. It's pretty epic, and there's plenty of other "did s/he die?" moments with other characters. I'm afraid it mostly holds back from cheesy, though.
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The character I'm thinking of is a major-minor, but her story is definitely plot-critical and has a major effect on one of the main characters. Furthermore, in a description that completely gives away which character this is, she disappears, comes back, fakes her own death, then comes back to aid the main characters' enemies. It's pretty epic, and there's plenty of other "did s/he die?" moments with other characters. I'm afraid it mostly holds back from cheesy, though.