Cruel Temptation

Episode 106 (1x106)

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When Eun Jae tells Hyun Ju that Ha Neul is Byeol Nim, she doesn't believe her that Ha Jo's sister could be Byeol Nim. So then Eun Jae explains that Ha Neul also suffered a bad fever when she was young, which affected her brain. When Hyun Ju finally realizes the truth, she sobs from finding her daughter, who she thought had died long ago. But soon, she hears that Ha Neul is missing, so she confronts Ha Jo about Ha Neul's whereabouts.