Girl's Day recently became the ambassadors of Plan Korea, and Sojin and Hyeri took to Twitter to show their excitement to support children all over the world!

Sojin tweeted, "Today will be our most proud day after debuting. After returning from Thailand next week, I'll probably be very proud of myself after that? I'm thankful for today. 'Plan Korea' fighting. FlyFly~."

She also shared adorable photos of herself and Hyeri making heart poses. Fans commented, "I'm so proud of you guys," "You have pretty hearts too," and "It's good to see that you guys are volunteering your time even in the middle of your busy schedule."

SEE ALSO: Girl's Day become the new ambassadors for 'Plan Korea' + concert for girls all over the world

Girl's Day will be working together with 'Raise Your Hand' and 'Because I'm a Girl' to support girls all over the world.