Love Contract has to be the worst, most confusing, and unsatisfying ending ever... in case you aren't familiar with it..
Spoiler: The girl finds out the guy originally dated her because of a contract, and they have a falling out. He has a plan to make a grand gesture to prove his love, and his friend picks up the girl to take her to the designated place. On the way, they get in a car accident. The friend dies, the girl goes into a coma. It ends with him carting her unconscious body all over the city, then with him carrying her into the ocean, presumably for them both to die/to shock her awake. First we see a scene of them as angels (?) in Heaven who only want to play but were sent to Earth to learn a lesson. Then we see a scene where she wakes up after he carries her into the water and they have a happy reunion. Then it shifts to a scene of them on the beach, getting married. Their friends run forward to congratulate them, including their dead friend. (The scene is fuzzy and it's unclear if this is a dream or if they're in heaven.) The end!**