Build Up is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Kang Maru is just an ordinary kid who likes what kids like and plays what kids play, But one day he was forced to watch a Football World Cup instead of an animation, simply because his father is a fan and is the owner of the TV set. At a glance of that said sports, he was mesmerized and fixated to a game of football that his heart is racing because of the intensity of that sports, unbeknownst to him he already love the game., because of this, he set his goal, and that goal is to be a football player!