PROBABLY the birthdate of the bottom (forgot his name was it jiwon?)
stroke count! the characters for jiwon’s name take 18 strokes of the pen to spell it out, & it’s something jiwon mentions at one point in the story. so jungwoo changed his number from 17 (which an ex picked for him) to 18 when he was drafted professionally to honour jiwon.
Ohhh right! Yes yes, somewhere in the cobwebs of my memory, I vaguely remember reading about the character stroke count. Thank you!
Why did his number change?