(you are in university. you have a company of friends but among them is your enemy. you and Jisung hate each other)

you lost your memory due to an accident. after some time, when you were sitting in a cafe, Jisung came up to you and sat opposite you. he seemed familiar to you. he decided to lie to you and introduce himself as your boyfriend I know you don't remember me...but I'm your boyfriend. you lost your memory...it's so sad he looked at you and chuckled