U may say whatever u want but Juna did grew up and went with character progress much better than the other two. While Yunseo still wasn't sure what she wanted until she heard that Juna is divorced, it was a spark to make her move on after her. And Saeha... not much to say, but it's not like she is the one at fault, If Yunseo had been more assertive and let her know that there would be nothing between them, maybe it would have made it easier for her to forget about the feeling.
But in the last chapter (26) Yunseo did say it was the last time they slept together. And then Saeha was following her in the streets, arguing about it. It was actually a pretty obsessive thing
U may say whatever u want but Juna did grew up and went with character progress much better than the other two. While Yunseo still wasn't sure what she wanted until she heard that Juna is divorced, it was a spark to make her move on after her. And Saeha... not much to say, but it's not like she is the one at fault, If Yunseo had been more assertive and let her know that there would be nothing between them, maybe it would have made it easier for her to forget about the feeling.