YESSSSS people who are upset are probably taku stans who are suffering fron 2nd lead syndrome to notice that taku is actually the toxic one for a change. His character is in my least favourite bl characters of all time - manipulated haesoo, fucked him every chance he got (even when he was sick or even when his friends were there), knew haesoo wasn't over joowon and took advantage of him when he was at his lowest, dude....I can't believe rooted for him. Joowon on the other hand...bruh,hands down. What a chatacter. What a character development. Wow. This isn't over and it makes me sad that they'll take a break from each other but finally end up together too. Phew! This manga was so good. People who hate the ending or the story can get bent.
They don't need therapy....they're perfectly flawed human beings trying to find out who they are and who they want and making mistakes and learning from them. I think you're too used to seeing perfect all-knowing always-right characters in a bl, this manga has an apt depiction of flawed imperfect characters - that doesn't mean that they need therapy. They face challenges, make choices, and then face the consequences. They're not fucked up they're human. This is partially how real life is - things don't work out most of the time but people move on.
As for Taku, his role from the 1st moment had been to take advantage of haesoo's confusion, he was the escape haesoo took to take a break from joowon, but instead realized he loved him too much to be with someone else. Joowon also grew up a lot thanks to this when he thought he would lose haesoo if he wasn't honest anymore. This is a great manga. And it isn't over so curb your "they need therapy" bs.