2PM's Chansung celebrated his 24th birthday (Korean age) with the cast and staff members of '7th Grade Civil Servant'.

"Thank you to everyone who congratulated me on the set of '7th Grade Civil Servant' ^^," he posted to his Twitter. "I wasn't even thinking about it, but I was moved when everyone celebrated my birthday even amidst the busy schedule. Thank you^^ I'll do my best!"

Accompanied with the post was the group photo above showing Chansung holding a birthday cake while being surrounded by actress Choi Kang Hee, Kim Min Seo, and staff members.

International fans also got into the birthday spirit trending #HappyChananaDay all the way to #1 on the Twitter worldwide trending list.

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Happy birthday, Chansung!