My Husband, Mr. Oh!

Who Is Trying To Kill Me? (1x9)

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A letter threatening to kill Seung Joo arrives at UBS Broadcasting Station, and Manager Choi thinks it'd be better to switch the producer to someone else. However, Eric insists on keeping Seung Joo as the main producer. Meanwhile, Jak Doo leaves a note for Seung Joo and disappears.