Dark Hole

Dong Rim’s Diary (1x11)

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The monster's weakness gets revealed. However, there's no liquid nitrogen around to test Hwa Sun's theory. Tae Han leads them to the Dermatologist department, where they think liquid nitrogen would be. On their way there, they run into mutants and desperately look for a way out. Meanwhile, Mr. Choi reads Dong Rim's diary and asks her about it.