I think heejoo knows Yuri have feelings for her
here's what i think:
1. she thinks yuri is really affectionate and close to her (she doesn't know it's romantic)
2. she knows yuri has a slight crush, but might disregard it as some light-child's type and doesn't think it's even serious at all
(i think more of no. 1, i think she doesn't know) but i might be biased bc i really like heejoo !
Not me crying my eyes out again