A South Korean passenger plane has been forced to turn back after it was found out that one of its doors wasn't completely sealed. 

A video filmed inside the Jin Air plane, which was carrying 163 passengers, shows a gap between the door and the door frame.

The plane on its way to Busan, but had to turn back to Cebu, Philippines, about half an hour after taking off.

Passengers say they suffered headaches and felt pain in their ears.

Head of Jin Air Busan office, Park Mun-seong, apologised for the incident.

Jin Air, the budget affiliate of Korean Air Lines, say they couldn't find any defects.

South Korea says it will review safety at its six budget airlines.

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