The happiest birthday celebration is to be able to provide help to others.
That's what exactly Infinite Dongwoo's fans did for his birthday last year. To celebrate his birthday last year, November 22, 2012, Dongwoo's fans collected funds and donated a well for Cambodia.
Thanks to Dongwoo's fansite (즐겨찾기) for conducting this donation. On their update, they revealed the good news. Dongwoo must be really proud of his fans.
"To commemorate Dongwoo’s birthday last year, the installation of a well in Cambodia donated by supporters of 즐겨찾기 in [동갑] has been completed. Due to the construction of the well, residents in that area can now drink clean water. Thank you to all who contributed in this project!"
Source: http://infinite-dw.com/