Season 1 of Cold Blooded Intern premiered on August 11, 2023.

Hae-ra who is sick and tired of being treated like a maid at home wants to go back out there and work again. She has trouble finding a job, as her career ended years ago. Luckily at that moment, Hae-ra receives an offer from her former colleague, Ji-won. However, the job Ji-won gives her is nothing as she expected. Ji-won wants Hae-ra to fire the other working moms at work. Although she feels guilty, her husband just got laid off. So, Hae-ra has no choice but to do as she is told and take the job. But suddenly Ji-won is pregnant. Will Ji-won be caught in a trap she set herself?