Spring 2015. The warm spring sunlight and lush flowers resemble a youth full of vitality. The documentary director captured the youth's 'Mr. Doyoung (22)' on camera. On the highway bus returning to school from hometown, Doyoung accidentally meets his first love, Yonghwa, whom he does not want to see in 10 years. One by one, the memories she doesn't want to recall come back to life. She struggles not to let him know who she is, but it's not as easy as her heart. Will Doyoung be able to overcome this difficult situation well?

Sohyun, a runaway, is left alone after her close friend Jungho disappears. By accident, she gets to know a transgender woman named Jane. She joins Jane and her close-knit community of runaways, who are as comforting and loving as a real family. Sohyun feels happy and at peace. But her happiness does not last long. There is something wrong with Jane’s health.

Hwa-young is an 18-year-old student living alone. Her friends call her "mom" and use her house as their place to hang out, but don't really include her in their clique. Hwa-young pays particular attention to one of the friends, Mi-jeong.

The awkward, distant, and wounded three sisters gather at their hometown for their father's birthday. However, on the day of the party, there is a big mess because of their little brother Jin-seob's abnormal behavior, and the past of the three sisters slowly reveals.

An unappreciated old granny magically turns 20 years old again and decides to make the most of her newfound youth.