Mischievous Kiss

A high school girl with low academic standing develops a crush on the top student in her class, but her advances are met with rejection and public embarrassment. Despite his initial disdain, circumstances eventually force the two into an unexpected connection.

Ha-ni faces growing hostility from Seung-jo and Eun-jo, while their mother, Hwang Geum-hee, finds satisfaction in having a daughter to care for and favor.

The school organizes a competition between senior honor students and senior underachievers to determine which group is superior, consisting of various physical challenges.

Oh Ha-ni's friends visit Baek Seung-jo's house while her family goes to the beach, where they experience a series of unsettling events including a near-drowning, accidental sand burials, and unexpected visitors.

Baek Seung-jo, inspired by Ha-ni's influence, comes to realize he has no passion for anything and surprises his family by deciding not to attend college.

As high school graduation approaches, Ha-ni takes on several part-time jobs to purchase a special gift for Seung-jo, only to repeatedly encounter him while fulfilling her work duties.

Ha-ni continues to pursue Seung-jo at college, despite his continued indifference. Oh Ki-dong decides it's time for them to leave Baek Soo-chang's house. Meanwhile, Eun-jo develops a crush.

Ha-ni, an inexperienced tennis player, is paired with Seung-jo for a doubles match against the skilled duo of Yoon He-ra and Wang Kyeong-Su.

Seung-jo reflects on having always been at the center of attention, while Ha-ni begins to see herself as the cause of misfortunes. Ha-ni's secret romance lessons for Kyeong-su draw unwanted attention and make her the subject of office gossip.

Ha-ni becomes convinced that Seung-jo and He-ra are living together after seeing them work together as waiters, and decides to constantly visit the restaurant in an effort to keep them apart.

Hwang Geum-hee continues her efforts to bring her son together with Ha-ni, but a new, kind and attentive boy begins to take an interest in Ha-ni, complicating her plans.

Baek Soo-chang's sudden outburst lands him in the hospital, compelling Seung-jo to abandon his planned path and step in to save his father's struggling business.

Seung-jo faces a difficult decision as he considers marrying the granddaughter of a key business sponsor to save his father's company. Meanwhile, Ha-ni, though upset, surprisingly agrees to start a relationship with Joon-gu.

Seung-jo and Ha-ni announce their decision to marry, and they must confront He-ra, Joon-gu, and Chairman Yoon to explain and manage the repercussions of their choice.

Seung-jo marries Ha-ni despite his initial reluctance, and the newlyweds must deal with the challenges of their honeymoon while avoiding interference from a troublesome couple.

Seung-jo delays registering their marriage until Ha-ni successfully completes her nursing exam, causing her to feel overwhelmed and unfairly treated.