To sell the slow burn story atmosphere, a drama needs to be accompanied with a memorable and fitting soundtrack. There was a desperate need for an actual original soundtrack in this one instead of filling it with random and generic sorrowful OST which ruined almost any big moment. Despite having an abundance of free time, the drama failed to give the side characters a "character", they never felt that they mattered. The drama behaved like a movie but failed to fit it in a drama (long) format. More often than not, it stuck out a bit too much and ended up being annoying.