A man in his 60s has been cleared of charges of flashing and trying to kiss a girl's hands, with the court ruling he was only urinating.

Police alleged the man exposed his genitals to two teenage girls playing on a slide in a playground at the start of the year.

He was also accused of trying to kiss the hands of a teenage girl riding a bicycle nearby.

The man had already been in jail on a two-year sentence for sexually abusing a minor in 2010. This time, he was charged with sexual abuse and public obscenity.

But Seoul Central District Court ruled on Friday that there was no evidence he intended sexual abuse or that he had behaved obscenely in public.

"There appears to be no reason to challenge the fact that he was merely trying to urinate while walking around the neighborhood," the court said.

"He may be guilty of a misdemeanor for illegally urinating on the roadside, but there is no incriminating evidence to prove he had other intentions," it added.