Secret Partner Dramacool - My

The drama revolves around Choi Gook (played by Ji Chang-wook), a former police officer who becomes a private investigator. He teams up with Kim Soo-young (played by Won Jin-ah), a prosecutor who is tasked with solving a murder case. As they work together, they develop a strong partnership and eventually fall in love. However, their relationship is put to the test when their pasts come back to haunt them.