Yn nhref brysur Caerdydd, roedd rostir coffi cuddiedig gyda golwg cynnes, araf a'r arogl coffi ffres yn y cornel.

In the bustling city of Caerdydd, there was a hidden coffee roaster with a warm, slow vibe and the aroma of fresh coffee in the corner.

Roedd ychydig o sinistr yn llenwi'r awyr wrth i'r hydref gau, a'r dail yn chwifio ar hyd y strydoedd.

A bit of eeriness filled the air as autumn closed in, and the leaves fluttered along the streets.

Roedd Gethin yn fiarista chwilfrydig.

Gethin was a curious barista.

Roedd llygad barcud, a bob amser yn chwilio am rywbeth newydd i'w ddarganfod.

He had a hawk's eye and was always searching for something new to discover.

Yn nhywyllwch yr hydref hwn, roedd ei feddwl yn llawn syniadau am nofel cyffrous.

In the darkness of this autumn, his mind was full of ideas for an exciting novel.

Un diwrnod roedd yn clywed sŵn rhyfedd yn dod o'r ystafell sydd bob amser wedi bod dan glo.

One day, he heard a strange noise coming from the room that had always been locked.

Roedd hyn yn digwydd bob nos, a phob tro, roedd yr ystafell honno'n rhywbeth o dirgelwch.

This happened every night, and each time, that room was something of a mystery.

“Pwy sy'n gwneud y sŵn?

"Who is making the noise?"

” gofynnodd Gethin iddo’i hun.

Gethin asked himself.

Ond roedd Caradoc, y perchennog, bob amser yn rhybuddio Gethin i gadw draw.

But Caradoc, the owner, always warned Gethin to stay away.

“Peidiwch â phoeni am yr ystafell honno,” roedd Caradoc yn dweud.

"Don't worry about that room," Caradoc would say.

“Mae'n gyfrinachol iawn.

"It's very confidential."

” Roedd Caradoc yn ddirgel, ac nid oedd yn gadael neb mewn.

Caradoc was mysterious, and he let no one in.

Rhian, cyd-fyarista Gethin, oedd y llais rheswm yn y caffi.

Rhian, Gethin's fellow barista, was the voice of reason in the café.

“Paid â thrio'n galed, Gethin.

"Don't try too hard, Gethin.

Dim ond stori yw e,” roedd Rhian yn annog.

It's just a story," Rhian encouraged.

Ond ar noson Calan Gaeaf, roedd penderfyniad Gethin yn gadarn.

But on Halloween night, Gethin's resolve was firm.

Roedd yn aros yn dawel wrth i'r caffi gau a chadw yn dawel wrth i'r oriau llithro heibio.

He remained quiet as the café closed and stayed silent as the hours slipped by.

Roedd y darluniadau o flodau rhyfedd yn chwalu'r ystafell, gan ddarparu îsbryd honeddfydd ar yr hyn a wynebai o'r diwedd i'w dull ecsentrig go iawn.

The illustrations of strange flowers adorned the room, providing a vibrant spirit to what he eventually faced with his truly eccentric approach.

Wrth i'r cloc daro hanner nos, llwyddodd Gethin i'w hysgloi nid yn unig ei weledigaeth o orwedd ar draws y cloi wedi mynd — gydag ychydig o ysgogiad drannoeth i'w ffrind Rhian — ond yna i mewn i ffordd lifflat, ac annisgwyl oedd bai yn berthyn i'w helaeth.

As the clock struck midnight, Gethin managed not only to unlock his vision of sprawling across the lock that had vanished—with a little nudge the next day to his friend Rhian—but then into a smooth and unexpected path belonging to his vast findings.

Yr hyn a ddechreuodd fel twyll yn datgelu goleuni hyfryd a gwyntog oedd dilys.

What began as a prank revealed a lovely and breezy light that was genuine.

Roedd yn stori nid yn herbyn iddo ef ei hun, ond un beth oedd iddo ddarganfod beth oedd ystyr darganfyddiad gwirion anogaeth.

It was a story not against himself, but rather one where he discovered what the true meaning of discovery and odd encouragement was.

Y tu mewn i'r ystafell, roedd Caradoc a Rhian wedi addurno'r cwt gyda golygfa accwstant.

Inside the room, Caradoc and Rhian had decorated the shed with an astonishing scene.

Addursyn gyda phrawf y gosodiad a llachar, ffigyrau calan Gaeaf lliol oedd eu bwriad.

Decorated with displays of setup and bright, colorful Halloween figures was their intention.

Roeddent wedi paratoi prank ysbrydol i Gethin, herio'r cyfateb hynny wedi ei gyflawni.

They had prepared a spiritual prank for Gethin, challenging the correspondence that had been achieved.

Roedd Caradoc a Rhian wedi creu prank arbennig ar gyfer Gethin.

Caradoc and Rhian had created a special prank for Gethin.

Roeddent am weld ei adwaith ac gyda'r addurniadau mawr, digwydd diwrnod o hwyl.

They wanted to see his reaction, and with the grand decorations, a day of fun happened.

Fe wnaeth y diwrnod hwn agor llygaid Gethin i wneud hynny.

This day opened Gethin's eyes to embrace it.

Cawsai ysbrydoliaeth o'r jôc hon, sylweddoli gwerth dychymyg ac ysbryd cymdeithasol.

He drew inspiration from this joke, realizing the value of imagination and social spirit.

Roedd yn barod iawn, eto, i ysgrifennu ei nofel gyda safbwynt newydd erbyn diwedd.

He was more than ready to write his novel with a new perspective by the end.

Roedd dydd sinistr Calan Gaeaf wedi troi'n ddiwrnod o gyfeillgarwch a ffantasi.

The sinister Halloween day had turned into one of friendship and fantasy.