Super Junior's Siwon has been playing a game of 'catch-me-if-you-can' on Twitter with his fans!

The game began on January 21st after Siwon tweeted a photo from Korea's Incheon International Airport. "I'm at [the] Incheon airport now. Go[ing] somewhere. Let you guess -- it's going to be fun," he teased.

After arriving at his destination, Siwon tweeted, "Great city and passionate! Delicious food! Haha. Good morning, beautiful world!"

Fans scrambled to find out where the idol had jetted off to, and finally got a clue with his next tweet. "Ate too much. Beautiful street. I can feel [the] splendor here, it's a lovely place. [I'm going to] Let u guess where I am :)"

Siwon then attached a picturesque view of an unnamed street, giving fans the opportunity to use their research skills to discover where he is.

It didn't take long for them to figure out that Siwon was in London, England! Local fans recognized a landmark in the photo (the Ivanhoe Suite) and deduced that Siwon was in London's West End area.

They left replies like, "Enjoy your vacation, and stay warm!", "Come to Paris, too!", and "You deserve some time off ^^"

Keep your eyes peeled, London ELFs!

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Source + Image: Siwon's official Twitter