Who's Your Daddy?.

A hopeless uncle & nephew pair, Mark Gao and Xiao Hui, live their everyday lives scamming people and selling pirated DVDs. When their illegal business starts plummeting, they decide to sell their sperms for money, but their lives turn upside down when a tall, beautiful and sexy woman named Shuna walks into the sperm bank and becomes pregnant several months later. When the duo finds out about her pregnancy, they are determined to know who the real father of the child is. A series of comedic events unfold as the two of them go to outrageous lengths in order to win Shuna's heart.