I don’t mean to be rude, but in the end, it is the author’s world, it is their work and everything came out of their imagination. They do not have the obligation to please us, readers, because it’s their story.
Taku was very much needed for this story... Without him haesoo wouldn't have realized and owned up to his feelings. And joowon wouldn't have gotten his character development. Remember this is the authors story, please understand that. :)
Taku will also learn a lot tho? He has actually learned to humble down and not take his lovers for granted. To also become serious about his lovers which was the point of him getting together with Haesoo. He has learned so much too and he will definitely become a better person because of this said relationship ╮(￣▽￣)╭
Author, You don’t need a Character like Taku to get the main couples together. You just let us sad and angry .what’s the point !?