Heartbeat

Writer Park lives by writing day by day. One day, he stumbles upon a woman, Hae-joo, who collapsed on the street while taking a walk in the early morning. Hae-joo asks Park to take her home, saying she needs a place to rest. He kindly gives up his studio for a stranger. He begins his secret and cheeky story.

Jin-woo sees Seo-yeon and Dong-hyeon together and makes fun of the two. Annoyed with Jin-woo's jokes, Seo-yeon leaves but Dong-hyeon bit Jin-woo's words and misunderstands Seo-yeon's liking for him. Jin-woo starts teasing Dong-hyeon excitedly. Dong-hyeon who is clueless about anything is excited about his relationship with Seo-yeon.

So-ri a lyricist wearing large headphones, visits the same space every day. The anticipation that her first love Jin who disappeared long ago after the accident, will return again. So-ri's wishes become reality. Jin is back again. So-ri and Jin hide their secrets about each other and start a deep relationship that they couldn't even imagine before.

Seo-yeon is running a boarding house. She has a habit of changing men every quarter. Yeong-cheol, who was recently brought to the house is cute, but he tends to be clingy in relationships which makes her feel a little uncomfortable. When Yeong-cheol is away from home, he calls Min-soo to his house. Min-soo provokes Yeong-cheol when he knows how Seo-yeon feels. But Seo-yeon's mind is different... Who will win Seo-yeon's heart?

Kumiko Manguchi, a hot-blooded teacher in a red jersey miniskirt, is assigned to the private Hami Kin Gakuen, where the students who have fallen out gather