Twenty Five Twenty One (Season 1)

When we were 18, we first called each other by name. At 21, we fell in love.

In a time when dreams seem out of reach, a teen fencer pursues big ambitions and meets a hardworking young man who seeks to rebuild his life.

Episode 1 (Episode 1) 7.0
Writer: Kwon Do-eun
Air date: 2022-02-12
Runtime: 76 min
Overview: When the IMF financial crisis threatens to slash Na Hee-do's dreams, she sets out to get herself transferred to another school with a fencing program.
Episode 2 (Episode 2) 8.7
Writer: Kwon Do-eun
Air date: 2022-02-13
Runtime: 75 min
Overview: Though taken aback by Ko Yu-rim's cold attitude, Hee-do gives it her best in their first face-off. More of Back Yi-jin's situation comes into focus.
Episode 3 (Episode 3) 8.0
Writer: Kwon Do-eun
Air date: 2022-02-19
Runtime: 71 min
Overview: When a fortuitous opportunity presents itself, Hee-do begs her coach for extra training. An unanticipated visitor comes around hoping to see Yi-jin.
Episode 4 (Episode 4) 8.2
Writer: Kwon Do-eun
Air date: 2022-02-20
Runtime: 75 min
Overview: In exchange for a favor, Hee-do carries out a daily errand for Moon Ji-woong. She happens across a drunk Yi-jin after he fails another job interview.
Episode 5 (Episode 5) 8.7
Writer: Kwon Do-eun
Air date: 2022-02-26
Runtime: 77 min
Overview: Hee-do takes one giant leap closer to her dream. She's eager to tell Yi-jin the good news — but realizes he's disappeared without a trace.
Episode 6 (Episode 6) 8.7
Writer: Kwon Do-eun
Air date: 2022-02-27
Runtime: 75 min
Overview: Tensions run high between Hee-do and Yu-rim before an important event. Yi-jin takes on a new assignment, and spots a familiar face in the crowd.
Episode 7 (Episode 7) 8.7
Writer: Kwon Do-eun
Air date: 2022-03-05
Runtime: 73 min
Overview: A frustrating media narrative dampens a monumental moment for Hee-do. Yi-jin chases down the only person who may be able to set things right.
Episode 8 (Episode 8) 8.3
Writer: Kwon Do-eun
Air date: 2022-03-06
Runtime: 73 min
Overview: Hee-do perceives a growing distance between herself and Yi-jin, even as he moves back into the neighborhood. Trouble at home adds to Yu-rim's stress.
Episode 9 (Episode 9) 9.2
Writer: Kwon Do-eun
Air date: 2022-03-12
Runtime: 73 min
Overview: As Yu-rim's perspective on Hee-do shifts, so does her behavior. While Hee-do avoids seeing Yi-jin, he volunteers for a special documentary project.
Episode 10 (Episode 10) 9.0
Writer: Kwon Do-eun
Air date: 2022-03-13
Runtime: 71 min
Overview: Under the guise of work, Yi-jin takes Hee-do and Yu-rim on a weekend getaway to the ocean — and agrees to let Ji Seung-wan and Ji-woong tag along.
Episode 11 (Episode 11) 8.7
Writer: Kwon Do-eun
Air date: 2022-03-19
Runtime: 77 min
Overview: Hee-do grows upset when her career-obsessed mother fails to keep a promise. Yi-jin helps out Ji-woong's plans for a grand gesture at a music festival.
Episode 12 (Episode 12) 8.7
Writer: Kwon Do-eun
Air date: 2022-03-20
Runtime: 75 min
Overview: Unable to hold back from putting an end to a teacher's abusive behavior, Seung-wan stands her ground. Hee-do and Yu-rim support a distraught teammate.
Episode 13 (Episode 13) 8.7
Writer: Kwon Do-eun
Air date: 2022-03-26
Runtime: 75 min
Overview: Warnings about allowing his personal ties to affect his work weigh heavily on Yi-jin. The school fencing team enters their last competition together.
Episode 14 (Episode 14) 8.7
Writer: Kwon Do-eun
Air date: 2022-03-27
Runtime: 79 min
Overview: Shouldering the burdens of a sudden misfortune in her family, Yu-rim arrives at a decision that places her in hot water with the public.
Episode 15 (Episode 15) 8.3
Writer: Kwon Do-eun
Air date: 2022-04-02
Runtime: 89 min
Overview: Hee-do once again finds herself opposite her most formidable opponent. Yi-jin is busier than ever after transferring to another department.
Episode 16 (Episode 16) 8.3
Writer: Kwon Do-eun
Air date: 2022-04-03
Runtime: 90 min
Overview: In an emotionally charged exchange, Hee-do and Yi-jin confront the state of their relationship. Hee-do accidentally leaves her diary on a bus.