Saeyan was thinking Chan Min was with her purely out of pity for what happened with her, then later realized Chan Min's feelings to some extent and now knows he isn't with her out of pity, but she is also scared of the idea of them dating so now she still keeps saying the "Not dating" catchphrase, half reflex, and half forced.
Sora and Taesang moved in together and have experienced plenty of "husband-wife" times even if Sora herself refuses to acknowledge this fact. Now, even her own sister is supporting their relationship, plus about Taesang's secret, we didn't hear it yet, but it could also be something that pushes their relationship further into Sora realizing she loves Taesang.
Jua and Woo Dan have started out just 2 strangers with love at first sight. They are constantly talking, getting to know each other which is important in a budding relationship. Woo Dan has fought off his insecurities and has changed people's opinions thanks to them being in a "fake relationship" which can turn into a real one later on (once they find out about each other's past that they met as children and them being a vtuber, but there's no rush, its going quite fast considering daily releases and 4 couples)
Yeseo and Dosok also started as strangers. At first Dosok was quite oblivious about stuff but thanks to them getting to know each other more, he started falling in love, if not already in love with the Librarian. He is constantly changing thanks to her influence and match well, this is just a matter of time as well. At first, to him Soccer was the only thing that mattered, but now Yeseo is more important to him than Soccer.