Mae'n ddiwrnod arbennig ym marchnad Nadolig Caerdydd, gyda'r hafan yn llifogi o oleuadau disglair a'r arogl blasus o gacennau cri.

It's a special day at the Cardiff Christmas market, with the square flooding with bright lights and the delicious scent of Welsh cakes.

Mae'r strydoedd yn llawn pobl yn chwilio am anrhegion perffaith ar gyfer tymor y gwyliau.

The streets are full of people searching for the perfect gifts for the holiday season.

Wrth ochr un o'r beiriannau, mae Gwilym yn chwarae ei gitâr fel arfer.

Beside one of the stalls, Gwilym is playing his guitar as usual.

Mae canu'r straeon Nadolig yn llenwi'r awyr, ac mae cyfraniadau'n codi mewn potyn arian bychan ger ei draed.

The singing of Christmas tales fills the air, and donations are accumulating in a small money pot near his feet.

Ond, wrth iddo ddechrau pacio, mae popeth yn mynd o chwith.

But as he begins to pack up, everything goes awry.

Heb feddwl ddwywaith, mae Gwilym yn tynnu gitâr mewn achos tebyg i’w hun.

Without thinking twice, Gwilym grabs a guitar in a case similar to his own.

Mae’n barod i fynd pan sylweddola rhywun, yn feddylgar, fod rhywbeth o’i le gyda’i gitâr.

He's ready to leave when someone, thoughtfully, realizes something is wrong with his guitar.

Mae ei gitâr go iawn wedi mynd, ac mae ganddo un arall yn ei le.

His real guitar is gone, and he has another one in its place.

Mae’r gynulleidfa’n dechrau diflannu wrth i Gwilym ddeall ei gam a'r dryswch sy’n ei wynebu.

The crowd starts to disperse as Gwilym comprehends his mistake and the confusion facing him.

Mae'r farchnad yn orlawn, ac yn sydyn mae'n sylweddoli na fydd yn hawdd canfod perchennog y gitâr ddirgel.

The market is crowded, and suddenly he realizes it won't be easy to find the owner of the mysterious guitar.

Gwilym sy’n benderfynol, yn cerdded o stondin i stondin.

Determined, Gwilym walks from stall to stall.

Mae’n gofyn am help a gwybodaeth, yn atgoffa’r werin am mor hawdd yw drysu gitârs mortaio.

He asks for help and information, reminding the public how easy it is to mix up similar guitars.

Un stondin y mae'n cerdded heibio yw stondin Carys, sy’n gwerthu crefftau llaw, ac mae wedi bod yn gwyliwr tawel o’r comedi.

One stall he walks past is Carys' stall, where she sells handmade crafts, and she has been a quiet observer of the comedy.

Mae hi’n cynnig ei help ar unwaith.

She offers her help immediately.

"Pam na wnewn ni berfformiad bach anffurfiol?

"Why don't we do a little informal performance?"

" meddai'r Carys â gwên.

says Carys with a smile.

"Ben draw, gallwn denu’r gwir berchennog yn ein cyfeiriad.

"In the meantime, we might attract the real owner in our direction."

"Ac felly mae hi a Gwilym yn cynnull y torfeydd o amgylch gyda cân sionc a doniol.

And so she and Gwilym gather the crowds around with a lively and humorous song.

Mae'n dim ond ychydig funudau cyn i berson arall, gyda llygad lach, ddod ymlaen.

It's only a few minutes before another person, with a keen eye, approaches.

"Dewch i'r gitâr honno!

"That's my guitar!"

" mae'n galw gan wenu’n fras, hapus i weld ei gitâr.

they call out with a broad smile, happy to see their guitar.

Yn y diwedd, gydag ychydig o chwerthiniad a rhyddhad, mae Gwilym yn cyfnewid gitârs gyda'r perchnogyn iawn, wrth edrych ar Garys gyda diolchgarwch mawr.

In the end, with some laughter and relief, Gwilym swaps guitars with the right owner, looking at Carys with great gratitude.

Mae'r digwyddiad yn dod â phawb agosach at ei gilydd, gan gofio nad yw bywyd am bwysicaf yn y tymor prysur hwn, ond am gymuned a chymorth.

The event brings everyone closer together, remembering that life is not about the material things in this busy season, but about community and support.

Mae Gwilym, wedi dysgu gwers werthfawr, yn dweud ei ffarwel gyda chalon ysgafnach a dymuniadau gorau ar gyfer y Nadolig.

Having learned a valuable lesson, Gwilym says his farewells with a lighter heart and best wishes for Christmas.

Dyma stori o gymorth, chwerthin, a chyfeillgarwch, yn llawn o fywyd o dan y goleuadau liwgar.

This is a story of help, laughter, and friendship, full of life under the colorful lights.