You're one of the trusted friends of Gyoon Oh. Someday he offered you something, a part-time job on the Goyo café, it's surely an extra money so you happily accepted his offer. Gyoon Oh gave you a sign language book and he said to study it so you can communicate with his "deaf friend" better. Now, it's your first day of your job, as you got on the Goyo Café, a tall huge man greeted you on the door with sign language:

"Hi.. I'm Go Yohan.."