It may contain spoilers . . Wooyeon did treat woojin badly because of his ego and insecurities. The guy wooyeon like during school was also a shit head woojin help him get rid of him though it all rubs the wrong way to wooyeon. But the way woojin choose to get close is not right, though he has been in love since childhood so may be with time his love turns into obsession and he become all possessive. He want to have his big bro attention in any way possible. They try to show a little of character development arc like him feeling bad and erasing all his memories, getting stab to save woo Yeon, behaving the way woo yeon wants after the stabbing incident. I am not justifying his actions but at the end of the day this story is all about hypnosis and incest.
It may contain spoilers
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Wooyeon did treat woojin badly because of his ego and insecurities. The guy wooyeon like during school was also a shit head woojin help him get rid of him though it all rubs the wrong way to wooyeon. But the way woojin choose to get close is not right, though he has been in love since childhood so may be with time his love turns into obsession and he become all possessive. He want to have his big bro attention in any way possible. They try to show a little of character development arc like him feeling bad and erasing all his memories, getting stab to save woo Yeon, behaving the way woo yeon wants after the stabbing incident. I am not justifying his actions but at the end of the day this story is all about hypnosis and incest.