There anD twin guys and one girl the girl fell inlove with the black haired guy (i think?), but the black haired guy has a girlfriend already. He let his girlfriend into his house and the childhood girl also came in and the other twin. The two girls were cooking but the childhood girl warns the girlfriend that the black haired guy doesn't like this or that because his allergic or something......blah blah.....Ah! i remember the light haired guy's right hand or something can't catch anything because of the black haired guy...i think it was there childhood experience...it's the knife, the cause of it.