This show is too long for the simple story. Half the number of episodes would have sufficed.
The body switch could have been handled in a more humorous manner. Apart from the sanitary pad joke, there weren't many funny moments. They slipped too easily into their new selves. Body language wasn't differentiated sufficiently so after some switches it was hard to tell whether they were themselves or not. Too many switches. The cute vibe in the first part did not gel with the grief and angst of the second part. Patchwork story.
There was too much about the colleagues fighting and seniors and sabotage. In the end I couldn't are less who was doing what to whom.
Advertising is hardly life and death.
Kim Ji Eun looked dour for lots of the show. She is better in mainly serious dramas. Lomon looked like he was in a office attire fashion shoot.