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Viewers of 'Superman Is Back' know that Song Il Kook spent some time recently dressing up his adorable sons for a special calendar. It turns out that the calendar, which includes the photos he shot, is being released for sale for a good cause! All of the profits made will be donated to a charity, and the price of the calendar is 5,500 KRW (~ 5 USD).

The pre-order starts today and ends on the 31st, and the calendars will be shipped out on January 5th.