Desperate Mrs. Seon-ju

Are you sure you weren't joking? (1x84)

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Seon-ju becomes very suspicious of Sang-ah when she finds out the wrong floor plan was sent to Hansung, and So-woo busies himself with finding the evidence of Sang-ah's scheme and clearing Seon-ju's name. Meanwhile, Hye-ran is horrified to find out that Woo-sang and Mi-ju will be on the same variety show.