It leans towards the heartwarming and over the top sentimental department but the show majorly struggled to stretch the story into a 16 episodes, their solution was a series of subplots and fillers that felt hollow. It's like the 3 writers didn't agree with what direction they wanted to go and did their individual scripts instead.

One big major flaw was the writers ditched what seemed to be a major plot that they were brewing up from earlier episodes only to change direction midway.

A stalker follows and observes everything Dae Hyong does, he noted Dae Hyong's whereabouts and his change in moods and behaviors everyday. They even altered his voice to add to the mystery. But by the 2nd half, they revealed he was obsessed with Si-a instead. It unfolded in a very underwhelming way that lasted like a minute, everyone quickly moved on from it. The writers basically bait and switched. You would think the stalker was part of the major plot that would affect the main characters by how they were showing it from the beginning. Their workaround to change direction he was to make him be Si-a's stalker instead. It didn't add up and didn't make sense at all. This is such a bad writing, on top of already dragging story full of hollow subplots and fillers.