That sudden storyline near the end was super annoying

Haesoo getting amnesia just felt so unnecessary. I felt like the plot was developing very steadily, was readily picking up steam, and then suddenly at the climax he loses his memory and the whole story has to pause for that. Like it just felt like the author was padding the story out, which is weird considering it was so close to the end. Him having amnesia ended up not mattering, from what I remember