"The Gates of Hell"—that is what they call the doors to the surgical ward of Yeonseong Hospital. And I am Taesoo Choi, one of the many interns regarded as nothing more than tin can robots by some of the senior doctors. To escape this chaos, I went hiking, where I found the nearly lifeless body of the esteemed surgeon Dr. Kauffrene. Despite my efforts, it was too late to save him, but somehow I gained all his medical knowledge! Now my life is changing in ways I never expected, but is this a blessing... or a curse?