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Yi Soo is still hurting but she's in the mood for revenge. Jung-rok, Tae-san and Yoon are adjusting to having a new family member but end up accidentally embarrassing him.
As each person wonders about Colin's paternity, each couple experiences their own set of misunderstandings and unnecessary accusations are thrown.
Yi-soo is struggling to accept the reality of Do-jin's relationship with Colin, but in time she comes to a decision to fight for her relationship. In a strange turn of events, Colin is sent to Yi-soo's school and is placed in her homeroom.