I WANNA KNOW THE YELLOW SQUARE TOO but the phone is hinting to Seong-ah that Woo-yeol got his memories back (Seong-ah knows he's the owner of the phone -> tells Woo-yeol that the owner didn't ask for it to be fixed -> Woo-yeol says HE'S asking for it to be fixed because he knows it's Seong-ah's)
THIS IS TOO FUNNY WTF IS GOING ON WEIRD ASS DYNAMIC