Turns out Sangha and Jinwon had an interaction before

It was revealed that Sangha was the one bringing milk to Jinwon everyday when they were in highschool. So basically, this episode was about how Sangha came to know Jinwon and about the passcode thingy. Nothing much happened, but as always, the ending surprised me again just like the previous episode aackk I'm looking forward to the next episode.