They were already one of the Premier League's deadliest duos in front of goal, but then came Tottenham's 5-2 smashing of Southampton and the 6-1 embarrassment of Manchester United.
Who's better out of the two? It's pretty much impossible to tell at this stage. The good thing for Spurs, though, is that when the pair combine to good effect they're pretty much unstoppable.
So here's every goal they've combined for as creator and finisher in the Premier League. We're not counting penalties, as they're not as much fun.
Stoke 0-4 Tottenham - 10/9/2016
Son had a pretty quiet 2015/16 season, his debut campaign with Tottenham but started the following term in devastating form.
He scored twice in a 4-0 demolition of Stoke before setting Kane up for his first of the season.
Tottenham 3-2 West Ham - 19/11/2016
Spurs were trailing 2-1 to West Ham when Son was brought on in the 72nd minute, and it was his contribution that turned the game in Tottenham's favour.
His low cross eventually found its way to Kane, who had the simple task of tapping in at the back post for the equaliser. Son also won the penalty which Kane converted to seal Tottenham's victory, but this isn't fantasy football so it doesn't count – and like we said, it's not as fun.
Tottenham 5-0 Swansea - 3/12/2016
Kane and Son had already scored before they combined for the third in this 5-0 over Swansea.
Son charged towards the box before cutting back, inadvertently setting up Kane to slam into the far corner.
Manchester City 2-2 Tottenham - 21/1/2017
Hugo Lloris had a bit of a mare in this game, firstly misjudging a long punt over his defence for Leroy Sane's opener before spilling a cross, allowing Kevin De Bruyne the easiest goal he'll ever score.
However, Dele Alli nodded in to half the deficit before Kane and Son combined for the equaliser. The England international nonchalantly knocked the ball around the corner with the outside of his foot for Son, who bounced the ball past Claudio Bravo. Remember Claudio Bravo?
Tottenham 4-0 Bournemouth - 15/4/2017
It's just a lovely little flick from Kane to send Son through on goal here.
Everything was coming off for Spurs towards the end of the 2016/17 season and the partnership between the two star forwards was starting to become evident.
Leicester 1-6 Tottenham - 18/5/17
Remember when Kane got so angry at the thought of not winning the Golden Boot he decided to score seven goals in the final two games of the 2016/17 season? That was funny.
Also, for the first time here, we have multiple goal involvements in one game! Yay! Firstly, Son scrambled down the right before pulling it back for Kane to roll in. The roles of creator and finisher were switched for Spurs' fourth as Kane set Son running from his own half.
The South Korean pulled the ball back onto his right foot just outside of the area and curled into the far corner.
Tottenham 4-1 Liverpool - 22/10/2017
Dejan Lovren and Joel Matip were very bad in this game. Like, laughably bad.
Kane's assist for Son came when Lovren totally misjudged Lloris' throw, allowing Kane to cross from the right for Son to finish with ease.
Tottenham 5-2 Southampton - 26/12/2017
Kane set the record for most Premier League goals in a calendar year on Boxing Day in 2017 and marked the occasion with a hat-trick.
His second came from some delicious build-up as Dele Alli slid Son in down the left. The ball across goal needed only a slight nudge from Kane for his second.
Tottenham 4-0 Everton - 13/1/2018
Jonjoe Kenny was only about 12 years old when he was thrown in against Son, so you have to feel a little sorry for the Evertonian given how royally he was mugged off for Tottenham's second against Everton back in January 2018.
Forward Son spun defender Kenny and dragged the ball past him before getting away from Mason Holgate to cross low for Kane.
Tottenham 2-0 Huddersfield - 3/3/2018
It was Son who was the game winner against Huddersfield, scoring twice in a routine victory over the Yorkshire outfit.
Kane showed his awareness with a cross from the right which bounced perfectly for Son to head back across goal past Jonas Lossl.
Brighton 1-1 Tottenham - 17/4/2018
It's still something of a mystery how Son managed to prevent the ball spinning off the pitch for this goal.
He got to the byline in messy fashion before squaring for Kane, whose shot struck Bruno Saltor before going in.
Tottenham 1-0 Newcastle - 9/5/2018
Tottenham were never truly in the title race during the 2017/18 season but still needed victory over Newcastle in May to secure Champions League football for the following season.
Thankfully Kane was at his cool best when set up by Son in the 50th minute, placing an effort into the top corner from the edge of the box.
Tottenham 3-1 Southampton - 5/12/2018
This was another trademark cross from creator to finisher, with Son getting on the end of Kane's pass for an easy goal in a routine win over Southampton.
Everton 2-6 Tottenham - 23/12/2018
After this game, writers and fans up and down the country promptly asserted Tottenham were in the title race. They fell out of contention just as quickly as they were talked up, winning just three of their final 12 league games.
But regardless, this was still a ruthless display rounded off when Kane side-footed Son's low cross past the outstretched arms of Jordan Pickford.
Tottenham 1-3 Wolves - 29/12/18
Son didn't exactly lay this one on a plate for his forward partner. It was actually an effort way outside the box from Kane's left boot that Wolves goalkeeper Rui Patricio could only flap a hand at.
Pretty good goal really. Shame Spurs capitulated in the final quarter of the game to lose 3-1.
Cardiff 0-3 Tottenham - 1/1/19
This was about as routine a win as Tottenham got during the 2018/19 season.
They were three goals up by the half hour mark, with Son's third sealing the deal. The South Korean gathered Kane's pass in a tight area and shifted wider to the right before popping a shot back across Neil Etheridge.
Leicester 2-1 Tottenham - 21/9/19
The impressive thing here wasn't Son's backheel. It was Kane somehow getting a shot away despite having to deal with a massive shove in the back courtesy of Caglar Soyuncu.
The England captain stumbled towards the ground but still managed to bounce the ball off the ground and over Kasper Schmeichel.
Tottenham 5-0 Burnley - 7/12/19
There were a number of excellent goals in this 'contest', not just Son's run from his own half.
The game's opener was a corker, Kane smashing in a swerving effort from Son's nudged pass.
Tottenham 2-0 West Ham - 23/6/2020
We've missed a bunch of time here, haven't we?
That's because in the 2019/20 season, Kane got a nasty hamstring injury and then Son messed up his arm at Aston Villa.
They were playing together again when the Premier League restarted after the coronavirus hiatus, Kane sealing a 2-0 win over West Ham on the counter late on from Son's through ball.
Sheffield United 3-1 Tottenham - 2/7/2020
This was a pretty horrific game for Spurs fans. An early Kane goal was disallowed controversially for a handball in the buildup before Sheffield United charged into a 3-0 lead.
Spurs did eventually cut their hosts open when Son squared for Kane in the 90th minute. A good game for the partnership stats, a bad game for everything else.
Southampton 2-5 Tottenham - 20/9/2020
It must be said that, while this game put the Son and Kane partnership back on the map, Southampton's defending throughout was atrocious.
Having taken the lead through Danny Ings, the Saints then elected to leave acres of space in behind their defence as Kane dropped into midfield, finding Son with chipped passes time and time again.
Four times to be exact. Great finishing from Son, but also one of the worst defensive displays you're ever likely to see.
Manchester United 1-6 Tottenham - 4/10/2020
Again, Tottenham were given a big helping hand by some more terrible defensive play, with United's Harry Maguire, Eric Bailly and Luke Shaw particularly woeful on the day, but the link up between Son and Kane was still brilliant.
Some quick thinking from a free kick saw Kane send Son clean through, with the latter deftly chipping the ball past David de Gea and into the corner.
After Anthony Martial's red card, United gave the ball away on the edge of their own area, with the ball eventually tucked home by Kane from Son's pass.