I think you may need to write another discussion/explanation for all the people who saying that the twist at ep13…
It was linked to the main plot and it makes sense, so those people don't know what they're saying. If they want super light comedy romance, they shouldnt start drama, that was about death and trauma, ever since the episode 1, lmao.
The most surprising twist: Ji Osung is straight. I don't buy it!
But it is clear, that he liked both her and Jaebum in the messed up way, and he tried to kill them both, when they betrayed him. And so... He is bisexual.