8Uppers

Both movies deal with men trying to deal with raising a baby. Both are both very comical.

Song Na Young and her husband, Jung Sung Min, desperately want a child but her husband is unable to get her pregnant. Her husband's friends decide to help them. But Na Young suddenly loses her husband in an accident and she gives birth to her daughter but does not know which of her husband's friends fathered her child. The father of Na Young's child can either be Han Soo Hyun, Choi Kwang Hee, or Hwang Kyung Tae

They are both about multiple men learning how to take care of a baby on their own. 8Uppers is a little bit more serious than Waikiki, but they are both funny.