When Season 4 starts, it is discovered that Peyton has a half-brother named Derek and from there it gets
complicated. Mostly because Lucas over time gets paranoid about Derek and has hunches that something isn't right. This leads him to find a girl in a hospital with a wig and outfit that is identical to Peyton and the missing jacket from Tric that is Ellie's. Lucas further investigates causing a slight tiff with Peyton over how paranoid he is, but this leads to him being right; her brother wasn't her brother, but an imposter who was obssessed with her from her podcasts. But her real brother and Lucas take down the psycho and save Peyton. Along the way Luke encourages them both to try and bond, but ironically the two have trust issues, which mirrored similar personality traits that caused the two to eventually bond. Derek soon realizes that Peyton is in love with Lucas and tells her she needs to come clean with Luke. She does on the night of the banquet for the Ravens in honor of the team going to the state championship. They are both standing in her bedroom and all he could say was, "Oh...", which prompted and awkward moment and then him leaving. During the big game for...