Do you see this before in the weddings of Korea? 축하드립니다 This is one way of Koreans to congratulate the newly wed couple - by sending the flowers. Flowers are colorful, display is high in setting, and it really gives the impression of "big" gift to the couple and family.
It is a surprise for me because it appears only with chrysamthemum flowers (the same seting) in funeral, Koreans too.
Anyway, it is not a cheap gift. From what I searched online, it costs more than 100,000won. Thus, they are mostly are from company or family.