Eternal love, I have rewatched it several times, makes me laugh and cry. I skipped the 2nd couple - just watching main couple :) And I always feel happy in the end
The Princess' Man (the ML loses his eyesight so the ending is a little bitter sweet, but still much happier than the tragic ending the drama sets you up to expect)
Live Up to Your Name (this is a time travel drama with parts in the past and parts in the present)
Chinese:
Lost Love in Times
Sound of the Desert (everyone lives but the SL makes a sacrifice, so it's a little bittersweet)
The Eternal Love (the 24 episode drama)
The Imperial Doctress (the ending is slightly bittersweet / open, but not tragic)