[THE INVESTOR] Talking about staying at a motel in Korea has historically been an uncomfortable topic -- mainly because such accommodations have typically been considered venues intended for sexual activities. But to Lee Su-jin, the chief executive of motel-booking app Yanolja -- meaning “let’s play,” in Korean -- a motel means “possibility.” Yanolja is a rising star in the Korean online-to-offline start-up scene. It is also a pioneering business that helped a boy from a broken family turn his d