Shinwoo is passing time changing TV channels at Ik-Han's home, when he comes across the news of the disappearance of Mr. Lee, the security guard at his apartment. Shinwoo calls Yuna to make sure that she is safe. However, her phone is answered by a male voice. M-21 tells Shinwoo to come and rescue Yuna and that any involvement with police will lead to Yuna's death. Shinwoo wastes no time and dashes out while Ik-Han contacts the Principal.