Block B's P.O is having a birthday today. P.O is the youngest member of Block B, though he is one of the tallest and certainly doesn't look like the Maknae compared to some of the other members, but four of the seven members are all the same age so Maknae is just a formality in this group. P.O turns 20 today. He is one of the rappers of Block B. Happy Birthday P.O!!!!!