Return Scroll - Nearest Town

I met Olaf again in map. He says my training is still far from over and gave me a mission to hunt stronger monsters outside the town. Will I finally become a true adventurer once I finish this training?

I met this girl named Shumi in map. She was devastated about losing the lucky coin that she borrowed from a friend, and she asked me to find it for her. She also told me that a bunch of guys draped in white cloth took it from her in the subway, and that I might find them at the Construction Site B1, deep in the station... I should go there first...