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Lee Shin's attempted murder is revealed on the internet. Kun gets the black box video that recorded the incident and learns the truth.
Joo-yeon and Shin save Kun who fell into the water. Joo-yeon finds Kun's diary. Shin secretly burns Kun's emotional diary.
Teo succeeds in the 109 mouse reset experiment and becomes the leader of the research center. In order to find Sae-yan's biological father, Kun and Sae-yan look for old newspapers.