Ship Leesoo (십이수, Shib Yisoo; "Shibisu") is a D-rank Regular. He is relatively weak, yet possesses a great ability to deduce and an intellect on par with Koon's. Nonetheless, he made it past all of the tests on the Second Floor, where he was assigned the Scout position and is now climbing the Tower as the leader of his team. He is currently on the 39th Floor.