Rangi and Donna's passionate love affair was cut short when they discovered they were half-brother and sister.
The revelation drove Rangi to drink, and Donna away from the hospital for a while. When she returned they grew close again and their attraction was too strong to deny. Despite knowing it was incest, they slept together one more time. There were more revelations to come.
In the final episode of 1999, Donna discovered that her mother had had an affair -- she wasn't Rangi's sister after all! They wanted to be together, but Rangi couldn't leave his policewoman girlfriend Janet, whose leg had been crushed at an accident scene.
Finally, Donna found herself in trouble and when she turned to Rangi for support they became a couple. Their wedding was the big event of Episode 2000. Their happiness didn't last, but that's another story.
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