Twenty-Five Twenty-One (Korean: 스물다섯 스물하나) is a 2022 South Korean television series directed by Jung Ji-hyun and starring Kim Tae-ri, Nam Joo-hyuk, Bona, Choi Hyun-wook and Lee Joo-myung. The series depicts the romantic lives of five characters spanning from the year of 1998 to 2021. "Twenty-Five, Twenty-One" tells a love story between Na Hee-Do (Kim Tae-Ri) and Back Yi-Jin (Nam Joo-Hyuk). Na Hee-Do is a member of her high school fencing team. Due to the South Korean financial crisis, the high school fencing team gets disbanded. Getting through all the difficulties, she becomes a member of the sabre fencing national team. The South Korean financial crisis also causes Back Yi-Jin’s father's business to go bankrupt. This leads to a life change for Back Yi-Jin, from living the life of a wealthy person to a poor person. While studying, he works part-time jobs like delivery newspapers. Later, he becomes a sports reporter for a broadcasting network.