wait how long has passed since the whole "you dont accept me for who i am" quarrel? to grow it that lenght mustve took a few years or so sillyreader_
he did mention it almost has been 500 days since they started dating and the u dont love me for who i am timeline i THINK was a few months after they started dating or even less so the hair growth must have been only a year or so
LONG HAIR JAEYOUNG WAS SRSLY THE GO. it fits his character so well im so gladd