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With just hours to go before summer break, Kitty resolves to share her feelings with Min Ho, but a crowded trip to Busan threatens to kill the vibe.

Kitty returns to Seoul with a game plan for an unforgettable semester, only to discover a cocky ex-classmate is back — and out to upstage her.

As Min Ho works to pull off Eunice's video shoot, a stylish newcomer sets off Kitty's insecurities. Yuri hustles to make the most of a new opportunity.

Awaiting the results of their midterm exams, the group lets loose at an amusement park, where a daunting ride rattles Kitty's confidence.

Kitty tries to shake her suspicions as family and friends convene for a Chuseok feast, but drama erupts when explosive secrets spill into the open.

A visitor from home tries to lift Kitty's spirits. Eunice makes a career decision with consequences for Min Ho. Q and Marius retread the past.

Kitty scrambles to mend friendships ahead of Yuri's fashion show — and she's not the only matchmaker trying to stitch the group back together.

The KISS crew navigates old flames, new prospects and second chances as they gather to celebrate Kitty's 18th birthday.