The Interest of Love

The Interest of Love is a South Korean television series starring Yoo Yeon-seok, Moon Ga-young, Keum Sae-rok, and Jung Ga-ram,  based on a novel of the same Korean title by writer Lee Hyuk-jin. It aired on JTBC from December 21, 2022 to February 9, 2023, every Wednesday and Thursday at 22:30 (KST). It is also available for streaming on Netflix in selected regions.

Synopsis
The series follows the story of four young adults with different interests who meet each other at the Yeongpo branch of KCU Bank as they seek to understand the meaning of love.

Main

 * Yoo Yeon-seok as Ha Sang-soo: a manager at KCU Bank's Yeongpo branch who desires a normal lifestyle and believes that an unshakable life is the key to happiness.
 * Moon Seong-hyun as young Ha Sang-soo
 * Moon Ga-young as Ahn Soo-young: a fourth-year head teller at KCU Bank's Yeongpo branch who views love as a sand castle that can collapse in an instant, but finds herself feeling excited because of a man who suddenly appears in her life.
 * Keum Sae-rok as Park Mi-kyung: the self-assertive and straightforward assistant manager of the PB team of KCU Bank's Yeongpo branch who grew up in a wealthy family.
 * Jung Ga-ram as Jeong Jong-hyun: a sincere and diligent man who dreams of becoming a police officer and works as a bank security guard.

KCU Bank's Yeongpo branch

 * Moon Tae-yu as So Kyung-pil: Sang-soo's friend who is the chief of the general affairs department.
 * Jeong Jae-sung as Yook Si-kyung: branch manager.
 * Lee Hwa-ryong as Noh Tae-pyeong: deputy manager.
 * Park Hyung-soo as Lee Gu-il: a team leader.
 * Lee Si-hoon as Ma Du-sik: an assistant manager.
 * Yang Jo-ah as Seo Min-hee: a team leader.
 * Jo In as Bae Eun-jung: a manager.
 * Oh Dong-min as Yang Seok-hyun: Sang-soo's friend who is an insider and a deputy.
 * Oh So-hyun as Kim Ji-yoon: the youngest bank clerk.

Others

 * Seo Jeong-yeon as Han Jeong-im: Sang-soo's mother.
 * Park Mi-hyun as Shim Kyung-sook: Soo-young's mother.
 * Park Yoon-hee as Ahn In-jae: Soo-young's father.
 * Yoon Yoo-sun as Yoon Mi-sun: Mi-kyung's mother.
 * Park Sung-geun as Park Dae-sung: Mi-kyung's father.

Extended

 * Jo Yoon-soo as Cha Seon-jae: a high school student who dreams of becoming a police officer.