Roedd golau'r haul haf yn chwarae'n daclus ar gaeau rugbi Ysgol Uwchradd Caerdydd.

The summer sunlight played neatly on the rugby fields of Ysgol Uwchradd Caerdydd.

Ochr arall i'r maes, roedd ysmygiadau o ysbrydoliaeth yn ehangu wrth i'r myfyrwyr symud yn llon tuag at eu dosbarthiadau, ond nid pob un a oedd mewn hwyliau da.

On the other side of the field, a sense of inspiration was spreading as students moved cheerfully towards their classes, but not everyone was in good spirits.

Ar un pen y coridorau, sefai Dafydd, a’i wyneb yn gythryblus.

At one end of the corridors stood Dafydd, his face troubled.

"Mae'n rhaid i mi chwarae," meddai Dafydd yn daer.

"I have to play," Dafydd said earnestly.

Roedd ei freichiau'n gorwedd yn llonydd o flaen ei ffrind gorau, Rhiannon, wedi'i lapio'n braf mewn ceseiniau gwynion.

His arms lay still in front of his best friend, Rhiannon, warmly wrapped in white bandages.

Roedd ei ddwylo'n brathu wrth i'r boen ganiatáu cysgod o lusgo.

His hands ached as the pain allowed a shadow of dragging.

"Dafydd," meddai Rhiannon, ei llais yn dyner, "mae'r meddyg wedi dweud na ddylech chi.

"Dafydd," said Rhiannon, her voice gentle, "the doctor said you shouldn't."

""Rydw i'n gwybod, ond mae'n bwysig i mi.

"I know, but it's important to me.

Mae'r cryswyr yn dod i'r twrnamaint hwn.

The scouts are coming to this tournament."

"Rhiannon, bob amser y cyflymydd gorau, ymddangosai'n rhen, er bod cysgod ei phryder ei hun wedi'i brysurandeithrio ar ei bronnau.

Rhiannon, always the best motivator, appeared thoughtful, though a shadow of her own worries was busy preoccupying her mind.

Roedd hi'n poeni am ei dyfodol ei hun ar ôl graddio.

She was concerned about her own future after graduation.

Nid oedd hi yn siŵr beth oedd ei llwybr nesaf, ond erbyn hyn, roedd ei hamcaniaeth yn troi at gefnogi ei ffrind.

She wasn't sure what her next path was, but for now, her focus turned to supporting her friend.

Wrth i'r dyddiau hedfan heibio tua'r twrnamaint mwyaf tebygol o flwyddyn Dafydd, cefais iddo ddod yn amyneddgar wrth brif ddrws ysgol.

As the days flew past towards Dafydd's most significant tournament of the year, he found himself waiting impatiently by the school’s main entrance.

Gyda phob pasiedig arall, roedd ei frwydro yn erbyn y tynfa i fod allan ar y maes yn mynd yn anoddach.

With every passing encounter, resisting the urge to be out on the field became more difficult.

Daw’r dydd mawr.

The big day arrives.

Mae sylwebaethau uchel yn llanw’r gampfa wrth i’r cynghreiriau eistedd i lawr.

Loud commentary fills the gym as the leagues settle down.

Mae’n amser iddo wneud penderfyniad.

It's time for him to make a decision.

Ar nodyn byr, mae berlota i’w bartnerau tîm, ond y gwydyn traed yn tynnu â phob symudiad.

Briefly nodding to his teammates, he charges forward, but his feet drag with every move.

Wrth gamu ar draws y maes, wedi’i amgylchynu gan y ffrwd bresennol o anogaeth ac adlais, cafodd Dafydd gynnig ei orau.

As he steps across the field, surrounded by the current stream of encouragement and echoes, Dafydd gave his best.

Ond, roedd pob gafael enfawr, pob sigl di-baid yn cyflwyno poen sydyn.

But every massive tackle and relentless swing introduced sharp pain.

Roedd ei frwydr yn frwnt gan ei hun.

His struggle was a solitary one.

Mae Rhiannon yn sefyll ger y gadwyn, ei llygaid yn gorfod symud rhwng y cloc a’r gêm.

Rhiannon stands by the sideline, her eyes shifting between the clock and the game.

Maent yn rhannu edrychiad amlwg o ddealltwriaeth.

They share a look of mutual understanding.

Ar y terfyn, mae tîm Dafydd yn colli’r gêm, ond mae un wên fechan ar ei wyneb.

In the end, Dafydd's team loses the game, but a small smile graces his face.

"Diolch, Rhi," meddai Dafydd yn hwyrach fyth, wrth iddo eistedd gyda’i ffrind tu ôl i’r llwyfan.

"Thanks, Rhi," Dafydd says later, as he sits with his friend backstage.

"Rwy'n gwybod ei fod yn anodd, Dafydd," meddai Rhiannon, yn ei lapio ef mewn cysur tawel, "ond mae iechyd yn bwysicach.

"I know it was hard, Dafydd," said Rhiannon, wrapping him in quiet comfort, "but health is more important.

Bydd mwy o gyfleoedd.

There will be more opportunities."

""Ydy, a byddaf yn barod ar eu cyfer y tro hwn," dywedodd, yn derbyn y gwers yr oedd yn gwybod fod ei sefyllfa yn ei erlyn.

"Yes, and I'll be ready for them next time," he said, accepting the lesson he knew his situation was teaching him.

Roedd y dysg hwn yn ffordd newydd ar ei gyfer, ac roedd e’n benderfynol o ailgodi gyda chryfder a chynllun.

This lesson was a new way for him, and he was determined to rise again with strength and a plan.

Wrth iddynt adael yr ysgol y diwrnod hynny, roedd hi'n amlwg i Dafydd: weithiau, mae byw yn gofyn i ti ddewis dy iechyd dros wychder fyrhoedlog.

As they left the school that day, it was clear to Dafydd: sometimes, living requires choosing your health over fleeting greatness.

Roedd bywyd yn cynnwys mwy nag un dydd yn y maes, a roedd bywyd ar ôl ysgol yn cynnwys llwybrau heblaw un.

There was more to life than just one day on the field, and life after school included paths beyond just one.