Nobody Knows has a similar cross generational friendship, but swapped. Cha Young Jin is the adult counterpart (reserved, strong and caring like Lee Ji An) to Eun Hoo who is kind, sweet and responsible like Dong Hoon. Nobody Knows is not entirely slice of life, as there is a mystery element and some violence, however it is also very sublime and focused on the growth of the main characters and their relationships.
Both take place in an office setting and about in-office politics. It also contains wire-tapping and the tapper growing to respect/like the tappee due to listening and learning about their true selves. It also becomes like an obsession for them to listen in on the person's life. Chief Kim is a more lighter drama with some heavy themes, where in My Mister is a heavier with some light scenes.
Im Eun sub's character remind me of Park Dong Hoon in My Mister. both of them look kind of lost in the world full of loud people. an d trough the story we come to know them and their thoughts and this is so calming. both drama deal with deep sadness yet you come out of them with a feeling of being healed.