Hello, we are Taejeong Lee and Hyuk Heo, both iOS app developers at LINE. We had an opportunity to attend WWDC17 held at the San Jose Convention Center, from June 5th to June 9th. WWDC is an event for developers held by Apple every June in California. The event starts with the CEO’s keynote speech and is followed by 100 sessions and 200 labs in the course of 5 days, in which attendees can experience Apple’s latest software and technology. WWDC has been held in San Francisco in recent years, but this year, it was held in San Jose, which is regarded as the heart of Silicon Valley and is close to Apple Infinite Loop and Apple Park of Cupertino. This year, 5,300 developers from 75 countries attended the event. Well-serving its reputation as the icon of renovation, Apple did not fail to surprise the world with new ideas and technologies, and we are happy to share them with you.