Liar Town(2007)

The Truman Show reimagined in a manga! After his seven sons end their lives through extravagance, the president of a multinational company, Lee, decides to build a perfect town for his eighth son, Roonie. It is a small, peaceful town, and in the special care of his father's men, Roonie grows up to be a good boy. However, when he rescues Yuna passed out in town, romance comes unexpectedly to this naive boy. Yuna is his nemesis, a girl who thinks her father's suicide was caused by his sudden dismissal from Lee's company!