square rotating borders + flash || after effects

hi everyone! i tried my best to explain in easy terms ^_^ ive seen these borders everywhere but i think i found an easy way to do them! hope this was of help !!! ‪‪❤︎‬ programs: after effects, ★ program used to edit this video: capcut ⏾ audio: BOYNEXTDOOR - As Time Goes By (Inst.) ✦ person in video: Han Taesan and Kim Leehan of BOYNEXTDOOR ✿ my socials: TikTok: mychemicalriwoo Instagram: mychemicalriwoo Discord: thebamdungieever Thank you for watching! #leehan #taesan #tutorial #aftereffects #aftereffectstutorial #editing #edit #editingtips #editingtutorial #boynextdoor_19_99 #bnd #kpop #kpopedit #editinghelp