When his mother goes missing, Lee Ho-yeon sets out to search for her. In the course of that journey, he discovers his parents' pasts during the democracy protests of the 1980s when student activists rose up against the repressive Chun Doo-hwan regime. Reading a book written by his mother, Ho-yeon uncovers a story of hope, love and betrayal, and struggles to understand painful secrets that have been hidden away for thirty years.

Yoon Park
as Swallow

Woo Ji-hyun
as Ho-yeon

Park Mi-hyeon
as Eun-sook

Jang He-ryung
as Eun-sook (young)

Lee Dae-yeon
as Hyun-soo

Park So-jin
as Eun-mi

Yoo In-soo
as Hyun-soo (young)

Park Myung-shin
as Jin-gyeong

Jeon Soo-jin
as Jin-gyeong (young)

Park Soo-young
as Manager Kim