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Jowoon is probably as toxic as Taku as you say... he's supposed to be a stepbrother but instead he took Haesoo virginity and play with his feelings after he was ready to admit to himself that he had feelings for him. Then he (still as a stepbrother) got all angry whenever Haesoo had sex with someone and now he's angry because of a possible relationship of his brother.
Taku is a big talker, he doesn't have a clear mind of how to build a relationship and he doesn't seem to know how a couple works since he brings comfort to the other all the time because he thinks he needs it and that's his job done.
But all I'm trying to say is that I prefer Taku and Haesoo but at the end of the story it's better if Haesoo find a new path in life with no family problems and toxicity. The poor kid deserves to be happy and fairly loved ┗( T﹏T )┛
Kashima deserves everything good in this life ┗( T﹏T )┛♡