That’s according to his manager Mauricio Pochettino, who has noticed a key change in his star since November.
Son continues to prove his worth for Spurs and has become the main man in the absence of Harry Kane.
The forward spent the second half of last month away with South Korea at the Asia Cup.
When he returned to north London, he could not afford to rest after Spurs were dumped out of both the FA Cup and League Cup during his time away.
Despite feeling tired, the 26-year-old stepped up and has played a leading role in helping keep Tottenham’s faint Premier League title hopes alive.
Ahead of Saturday lunchtime’s trip to Burnley, Pochettino praised Son and his professional attitude.
“When Sonny playing with freedom is one player, but when you see him in games before November, he was so obsessed with playing and performing so well, he was thinking of the national teams, this and that and it was impossible to perform in the way you want,” he said.
“It’s a good example. It’s not easy to find a way to split from the responsibility of the business and the consequences of what can be in behind your performances or mistakes or decisions.
“After to find freedom to run and try. Of course that is football.”
There was a narrative that Son’s quality is under appreciated by football fans but his manager doesn’t buy into those suggestions.
“Sonny I think is a player who is very well rated by everyone,” he added.
“Of course since November he’s been doing a fantastic job for us.
“Of course after the Asian Cup he’s scoring goals and helping in a very delicate situation for us when different players were injured and I think he stepped up and is doing a fantastic job.
“I hope he can continue in the same way.”
The Argentine will be hoping that Son can keep up his rich vein of form now Kane is back.
The England captain is set to return to the bench today at Turf Moor just in time for the start of the run-in.