Six employees are sent back to primary school for a retraining program, joining real fourth-grade students in Class 4S. As unlikely friendships form and personal growth unfolds, a rule-breaking incident threatens it all.
 
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                            Episode 1
Episode 2
Episode 3
Episode 4
Episode 5
Episode 6
Episode 7
Episode 8
Episode 9
Episode 10
Episode 11
Episode 12
Episode 13
Episode 14
Episode 15
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