Image source, Getty Images

Only one image to leave you with... Paul Smyth celebrating his winning goal. On his debut! A moment to treasure for the young Northern Ireland forward.

Read our match report here.

Cheerio!

Stuart Elliott
Former Northern Ireland player on BBC Radio Ulster

You’d think Paul Smyth had about 50 caps under his belt. Michael will be looking for his debutants to be fearless and take the bull by the horns. I couldn't believe his finish – it was unbelievable. He looked like he’d been on the international scene for a long time.

And another debut goal means he's fast turning into the new Jermain Defoe... Defoe's scored on every debut, hasn't he?

So what do we know about Northern Ireland's newest hero Paul Smyth? He started out at Linfield and played in their Champions League qualifier double-header against Celtic earlier this season, shortly before a move to Championship side QPR in August.

After finding his feet in the west London club's Under-23 side, he was given a chance by manager Ian Holloway against promotion-chasing Cardiff on New Year's Day - and scored the winner.

Sammy Clingan
Former NI midfielder on Radio Ulster

It was fantastic that wee Smythy came on and scored a good goal. He’s a fantastic little boy. Fair play to him, he’ll be on a real high.

South Korea were very good in the top and middle third but they were weak defensively.

It was a good workout for the boys against a team going to the World Cup.

There were just 194 seconds between Paul Smyth coming on and scoring Northern Ireland's winner. You can't even make a decent cup of tea in that time.

Anyone thinking 'it's only a friendly' - you're wrong. So says a buoyant rendition of Sweet Caroline that is belted out around Windsor Park by some happy home fans.

Happy because they've beaten a team who are going to Russia in the summer. And happy because they've seen some impressive performances - both defensively and going forward - by young players who showed they can cut it against a team of decent pedigree.

John O'Neill
Former Northern Ireland defender on BBC Radio Ulster

Overall the goals were great. Michael O'Neill will take a lot out of the game. I enjoyed it, although it's only a friendly. The second phase of Michael's tenure has started with a win. The younger players did well and the older players showed they can still play at this level.

Smyth, the 20-year-old QPR forward, shares a warm embrace with skipper Gareth McAuley - a man who is old enough to be his dad - as the appreciation of the Green and White Army rings in his eardrums.

Paul Smyth could sit in the corner with the ball... nah. He goes past a South Korean defender and shoots at goal from a tight angle. And that's the last kick of the game.

That's the man of the moment right there - Mr Paul Smyth.

The home fans full of voice now... buoyed by Conor Washington making a nuisance of himself down the left flank. The home side want more...

Three minutes of stoppage time. No messing about from the referee, despite there being plenty more of stoppages and subs. He's probably got a plane to catch.

Is there more for Northern Ireland fans to cheer? Almost...

George Saville lines up a free-kick on the right edge of the South Korea box, whipping it to Liam Boyce who fires a first-time shot over the bar.

Move over Will Grigg. Windsor Park has a new hero...

"Paul Smyth's on fire, your defence is terrified!"

OOOOSH!

John O'Neill
Former Northern Ireland defender on BBC Radio Ulster

What a goal. You have to give credit to Conor Washington who man-handles the centre-back. Smyth gets on the ball and jinks inside the second centre-half. I think it was his second touch.

Players with that enthusiasm will help the older players to keep playing.

Image source, Reuters

Michael O'Neill makes his final substitution as young QPR forward Paul Smyth comes on for his international debut. What a fairytale this would be if he could get a winner...

John O'Neill
Former Northern Ireland defender on BBC Radio Ulster

We've got to see this period of pressure out. They had a tremendous opening 15 minutes and it looks they're going to have a similar final 15 minutes. We can't get near them again.

South Korea, encouraged by that opening for Kim Shin-wook, continue to put pressure on as they search for a late winner.

A well-worked short corner is pulled back to substitute Lee Chang-min, who takes a touch to steady himself and then hammer a left-foot shot over the bar. Always rising.

BBC Sport NI's Richard Petrie at Windsor Park: "Predictably given the number of substitutions which have punctuated the second half, the game has lacked a bit of spark after the break but the Northern Ireland supporters appear to be enjoying their afternoon, creating plenty of noise and going through their traditional repertoire of songs in the March sunshine."