Drama Stage S02E04 - Push and Out of Prison

Joo Young works at a small office. She is indifferent to the world. She wants to separate her personal life from her work and buys a used cellphone. On her new cellphone, she finds middle-school student Hee Joo being bullied on social media. Hee Joo is the previous owner of the used cellphone Joo Young bought. Joo Young, who normally doesn't care about other people, tries to save Hee Joo.