Not the absolute best burger I've ever had, but really good, especially for the price. PB+ is a quaint little shop that serves good burgers and a decent chicken sandwich that doesn't cost krw10,000 (or more). The standard set comes with fires and a drink for krw6,500. The guys are always friendly and welcoming - a nice place to stop on the weekend or evening. It's also Halal certified. Just across form the school on Usadan, towards the river from Itaewon.