If you get run out. But if you are not and the overthrow goes to the boundary you will get 5 even if you were in the process of taking the run and hadn't completed it. Look around youtube video where batsmen try taking a quick single and the fielder throws at the stumps and it goes for 4. Even though the runout chance was missed and the batsmen hadn't completed the run, 5 runs are awarded, not 4. You won't see the batsman who had hit the ball for the quick single take the strike after the overthrow coz no. of runs awarded are 5 and not 4.
Here's an example from youtube on similar lines... see that the batsmen haven't completed the single before the ball hit the helmet and thus were awarded 6 runs (look at 0:14 mark where the ump explicitly makes the signal for 6 runs with his hands, and not 5). The ball was dead as soon as it hit the helmet yet 6 runs were awarded and not 5. Overthrows are the same. If thhe batsmen were in the process of taking a run while overthrow occured that run + 4 (if overthrow was a boundary) are awarded.
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Yes, it is.