Because they believe that by eating rice cake, they would have longer lives.
Here are some of the common rice cakes in Korea. (But Jane doesn't know the names)
They are yummy but for non-Korean, they may taste strange. :)





Korean has seaweed soup on thier birthday.
Because after a mother gave birth, she would have seaweed soup that good for women health.
So, during birthday, eating seaweed soup is for remembering how suffer thier mother was when giving birth.
There are many types of seaweed soup.
Such as :





After have been staying in Korea for more than 6 years, Jane has seaweed soup and rice cakes on her birthday and during new year as well. :)