The South Korean international star took his tally in the world-famous competition to six in four games this season with his hat-trick in Sunday's 6-0 win over Millwall, making him the first Spur since Paul Gascoigne in 1990-91, the year we last won the trophy, to net six times in a single FA Cup campaign.
But the 24-year-old's apparent love affair with the tournament didn't just start this season.
Back in January, 2016, he opened his account in spectacular style with a stunning strike in our 2-0 third round replay win at Leicester City.
Like many of our other players, Sonny has previously told us how he'd heard all about the fabled competition before he came to England in 2015: "The FA Cup is the biggest cup in England and I really enjoy it when I play in this competition.